EDITH BROWN CLEMENT, Circuit Judge:
Carmen De Jesus Boche-Perez (“Boche-Perez”) appeals from a criminal conviction pursuant to a conditional plea agreement in which he pleaded guilty to knowing possession of child pornography, but reserved the right to appeal the denial of a motion to suppress a series of confessions given to border patrol agents. For the following reasons, we AFFIRM the district court’s ruling on the motion to suppress.
FACTS AND PROCEEDINGS
Boche-Perez, a lawful permanent resident, was apprehended while entering the United States at the Laredo, Texas, port of entry on Wednesday, October 27, 2010. Customs and Border Patrol (“CBP”) agents initially detained Boche-Perez for inspection at 9 a.m. after an ID check revealed that he was flagged as a suspected narcotics smuggler. Because Boche-Perez had a criminal history, border [332]*332agents followed procedure and took Boche-Perez to the hard secondary inspection room, where he sat handcuffed to a chair for officer safety. After questioning and holding Boche-Perez in custody, CBP agents determined that Boche-Perez was eligible to enter the country. A final search of Boche-Perez’s luggage at approximately 12:40 p.m., though, turned up DVDs containing child pornography. Boche-Perez does not contend that his detainment or the searches leading up to this point were unconstitutional.
Once the CBP agents discovered the DVDs with child pornography, they stopped questioning Boche-Perez and contacted Immigration and Customs Enforcement (“ICE”). An ICE agent arrived at the port at about 1 p.m. At approximately 1:50 p.m., the ICE agent read Boche-Perez his Miranda warnings and began interviewing him regarding the DVDs. Boche-Perez waived his Miranda rights and denied knowing that the DVDs contained child pornography. The interview ended shortly before 3 p.m., at which point the ICE agent contacted an Assistant United States Attorney, who agreed to prosecute Boche-Perez at 3:22 p.m.
The ICE agent then informed Boche-Perez that he was being arrested for possession of child pornography and that he would be transported to the Webb County jail. At that time, however, Boche-Perez still had to be processed for admittance and paroled into the United States. Accordingly, at approximately 4 p.m., a CBP agent interviewed Boche-Perez to process him into the United States. The CBP agent gave Boche-Perez his Miranda warnings again, and after he waived his rights, he confessed at approximately 4:15 p.m. In his confession, Boche-Perez specifically admitted that he knew the DVDs contained child pornography even before they were discovered in his luggage at the border. After the 4:15 p.m. oral confession, the CBP officer began the preparation of a written confession. The CBP officer took from approximately 4:20 p.m. to 5:10 p.m. to prepare the statement. Boche-Perez then reviewed the statement, and signed the written confession at 6 p.m.
At 9 p.m. CBP informed ICE that Boche-Perez had confessed and was ready to be transported to the Webb County Sheriffs office. Before transporting Boche-Perez to jail, however, the ICE agent who had arrested Boche-Perez questioned him again. ICE’s second round of questioning elicited statements from Boche-Perez regarding his possession of additional child pornography at his home in Arkansas. The ICE agent gave this information to law enforcement officers in Arkansas and asked them to obtain a search warrant for Boche-Perez’s residence. That search subsequently yielded evidence of further child pornography offenses.
Boche-Perez was booked into the Webb County jail at 11:40 p.m. The ICE agent admitted at the suppression hearing that the federal building was less than 15 minutes from the bridge where Boche-Perez was arrested, and that the Government had agreed to prosecute Boche-Perez by 3:22 p.m. on October 27th. The ICE agent further admitted that at 3:22 p.m. he had the information needed to prosecute, and that the criminal complaint would be only two-to-three pages. Nonetheless, Boche-Perez spent two nights in jail, and was presented to the magistrate judge on the morning of Friday, October 29, 2010. According to the ICE agent, the delay occurred because the United States Attorney’s office requires the paperwork for an initial appearance to be submitted for approval by 4 p.m. on the day before presentment to the magistrate, and the ICE Agent did not .believe he had time to meet [333]*333the 4 p.m. deadline after only getting the agreement to prosecute at 3:22 p.m.
In ruling on Boche-Perez’s motion to suppress, the district court found that he was not presented to the magistrate judge within six hours, but that his statements were voluntary and not a consequence of the delay. Finding that the delay was not created for the purpose of extracting a confession, but rather resulted from delays arising out of administrative processing and the need for coordination across multiple law enforcement agencies, the district court denied Boche-Perez’s motion to suppress his statements on the basis of a delay in presentment. The district court also determined that his confessions were voluntary, and that no Miranda violation had occurred.
After the motion to suppress was denied, ' Boche-Perez entered a conditional guilty plea to knowingly possessing child pornography. Boche-Perez reserved the right to appeal the denial of the motion to suppress. The district court sentenced him to 63 months in prison and to 5 years of supervised release. Boche-Perez timely appealed.
STANDARD OF REVIEW
In reviewing a motion to suppress, this court reviews the district court’s legal determinations de novo and its factual findings for clear error. United States v. Gonzales, 121 F.3d 928, 938 (5th Cir.1997). We look at the evidence in the light most favorable to the prevailing party, United States v. Lopez-Moreno, 420 F.3d 420, 429 (5th Cir.2005), which here is the Government. A district court’s ruling on a motion to suppress may be affirmed on any basis supported by the record. United States v. Ibarra-Sanchez, 199 F.3d 753, 758 (5th Cir.1999).
DISCUSSION
Boche-Perez challenges (1) the district court’s denial of his motion to suppress his three confessions on the basis of an unreasonable delay in presentment, (2) the district court’s denial of his motion to suppress his three confessions on the grounds that they were involuntary, and (3) the district court’s denial of his motion to suppress his final confession on the basis of a claimed Miranda violation. Boche-Per-ez’s arguments do not succeed.
1) Delay in Presentment
Rule 5 of the Federal Rules of Criminal Procedure requires that “[a] person making an arrest within the United States must take the defendant without unnecessary delay before a magistrate judge.” Fed.R.Crim.P. 5(a)(1)(A). Rule 5 codifies the common-law rule of “prompt presentment,” which required that an officer take an arrested person before a magistrate “as soon as he reasonably could.” Corley v. United States, 556 U.S. 303, 306, 129 S.Ct. 1558, 173 L.Ed.2d 443 (2009). In McNabb v. United States, 318 U.S. 332, 63 S.Ct. 608, 87 L.Ed. 819 (1943) and Mallory v. United States, 354 U.S. 449, 77 S.Ct. 1356, 1 L.Ed.2d 1479 (1957), the Supreme Court established a remedy for violations of the prompt-presentment requirement: suppression of any confession obtained during a period of unreasonable delay. Corley, 556 U.S. at 309, 129 S.Ct. 1558.
In 1968, Congress modified the McNabb-Mallory framework by enacting 18 U.S.C. § 3501. Section 3501(c) provides that a court may not suppress a confession made during a six-hour safe-harbor period solely due to a delay in presentment if the confession was made voluntarily.1 See Corley, 556 U.S. at 322, [334]*334129 S.Ct. 1558. Section 3501(c) also permits for an extension of the six-hour safe harbor in any case in which the delay in bringing such a person before a magistrate is found by the trial judge to be reasonable considering the means of transportation and the distance to be traveled to the nearest magistrate. Confessions provided outside § 3501(c)’s safe-harbor, however, remain subject to the McNabb-Mallory exclusionary rule. Id,.; see also United States v. Cantu-Ramirez, 669 F.3d 619, 625 (5th Cir.2012).
Because this circuit has yet to address the viability of its pre-Corley case law in cases involving presentment delays that fall outside of the safe harbor, we must first address the implications of Corley.
(A) Effect of Corley on Existing Case Law
This circuit abides by the rule of orderliness, under which a panel of the court cannot overturn' a prior panel decision “absent an intervening change in the law, such as by a statutory amendment, or the Supreme Court or by our en banc court.” Technical Automation Servs. Corp v. Liberty Surplus Ins. Corp., 673 F.3d 399, 405 (5th Cir.2012) (internal quotation marks omitted). “[F]or a Supreme Court decision to change our [cjircuit’s law, it must be more than merely illuminating with respect to the case before the court and must unequivocally overrule pri- or precedent.” Id. at 405 (internal quotation marks and alterations omitted). Our inquiry is whether Corley unequivocally overruled our existing precedent concerning McNabb-Mallory. We hold that it did.
Before Corley we treated a delayed presentment as just one factor to be considered as part of a totality-of-the-circumstances evaluation into whether a confession was given voluntarily. See, e.g., United States v. Perez-Bustamante, 963 F.2d 48, 52-53 (5th Cir.1992); United States v. Bustamante-Saenz, 894 F.2d 114, 120 (5th Cir.1990). Delays longer than six hours “merely constitute[d] another factor to be considered by the trial judge in determining voluntariness.” United States v. Hathorn, 451 F.2d 1337, 1341 (5th Cir.1971). Corley unequivocally held that our prior approach was in error.
Corley makes clear that even voluntary confessions should be suppressed if they occurred during a period of unreasonable delay. “If the confession occurred before presentment and beyond six hours,” the Supreme Court instructed, “the court must decide whether delaying that long was unreasonable or unnecessary under the McNabb-Mallory cases, and if it was, the confession is to be suppressed.” 556 U.S. at 322, 129 S.Ct. 1558. Accordingly, we take this opportunity to confirm that, [335]*335to the extent our previous cases have indicated that a greater-than-six-hour delay is only a component of a broader voluntariness examination, those cases were overruled by the Supreme Court in Corley. Instead, when presented with a delay outside of the safe harbor, a district court must apply the McNabb-Mallory doctrine to determine whether the delay in bringing a suspect before a magistrate was reasonable.
B) Standard for Determining Violations of McNabb-Mallory2
Mallory provides the following guidance for determining whether a confession happened after a period of unnecessary delay:
The police may not arrest upon mere suspicion but only on ‘probable cause.’ The next step in the proceeding is to arraign the arrested person before a judicial officer as quickly as possible so that he may be advised of his rights and so that the issue of probable cause may be promptly determined. The arrested person may, of course, be ‘booked’ by the police. But he is not to be taken to police headquarters in order to carry out a process of inquiry that lends itself, even if not so designed, to eliciting damaging statements to support the arrest and ultimately his guilt.
The duty enjoined upon arresting officers to arraign ‘without unnecessary delay’ indicates that the command does not call for mechanical or automatic obedience. Circumstances may justify a brief delay between arrest and arraignment, as for instance, where the story volunteered by the accused is susceptible of quick verification through third parties. But the delay must not be of a nature to give opportunity for the extraction of a confession.
354 U.S. at 454-55, 77 S.Ct. 1356. As noted by the Supreme Court, the doctrine proscribes only unnecessary delays, and not delay itself. Accordingly, when applying McNabb-Mallory, a court cannot simply “wateh[ ] the clock,” and treat the doctrine as “a carpenter’s measuring stick to be used by merely laying it alongside the material to be evaluated.” Muschette v. United States, 322 F.2d 989, 991 (D.C.Cir.1963), vacated on other grounds, 378 U.S. 569, 84 S.Ct. 1927, 12 L.Ed.2d 1039 (1964). A six-hour delay in presentment should not be treated as a sort of talismanic formula that renders all confessions made after the delay inadmissable: “[a] lapse of hours between arrest and arraignment, standing alone, does not require the exclusion of a statement made during the period.” United States v. Jaswal, 47 F.3d 539, 542 (2d Cir.1995); see also Muschette, 322 F.2d at 991. “The mere fact that a confession is made while [the accused] is in custody of the police does not render it inad-missable,” McNabb, 318 U.S. at 346, 63 S.Ct. 608, because “it is the need for the delay rather than its length that is controlling.” 1 Chai-les Alan Wright & Andrew D. Leipold, Federal Practice and Procedure: Criminal § 73, at 179 (4th ed.2008).
[336]*336Accordingly, a McNabb-Mallory challenge requires a district court to make two determinations:
Initially, the court must determine the length of the delay. The McNabb-Mallory clock starts to run from when the obligation to take the defendant before the federal magistrate arises, see United States v. Alvarez-Sanchez, 511 U.S. 350, 359, 114 S.Ct. 1599, 128 L.Ed.2d 319 (1994), to the point at which the confession was rendered, see, e.g., United States v. Mitchell, 322 U.S. 65, 70, 64 S.Ct. 896, 88 L.Ed. 1140 (1944); United States v. Brown, 459 F.2d 319, 324 (5th Cir.1971).3 McNabb-Mallory concerns itself with “the time of confession, not the time of first appearance.” 1 Wright & Leipold § 73, at 177. If that period is shorter than six-hours, or alternatively, any extension of the safe harbor “considering the means of transportation and the distance to be traveled to the nearest available such magistrate judge or other officer,” 18 U.S.C. § 3501(c), then the McNabb-Mallory inquiry is at an end.
But if the length of the delay is determined to fall outside of the § 3501(c) safe harbor, then the court needs to move on to the second step of the analysis and examine whether the causes of the delay were justifiable under the McNabb-Mallory cases. The defendant has the burden of demonstrating a McNabb-Mallory violation. See, e.g., Brown, 459 F.2d at 324; Joseph v. United States, 239 F.2d 524, 527 (5th Cir.1957); White v. United States, 200 F.2d 509, 512 (5th Cir.1952).4
McNabb-Mallory case law rejects delays when those delays have either (1) a non-existent or (2) an unacceptable justification. A non-existent explanation (ie., delay for delay’s sake) is unacceptable under McNabb-Mallory because a delay for delay’s sake is, by definition, unnecessary to any legitimate law enforcement purpose. See, e.g., United States v. Yong Bing-Gong, 594 F.Supp. 248, 254 (S.D.N.Y.1984), aff'd sub nom., United States v. Bing-Nam, 788 F.2d 4 (2d Cir.1986). Similarly, a delay for the purpose of interrogation “is the epitome of [an] unnecessary delay.” Corley, 556 U.S. at 308, 129 S.Ct. 1558; see also Rogers v. United States, 330 F.2d 535, 538 (5th Cir.1964). But beyond either unexplained delays or purposeful delays for criminal interrogations, courts have been “careful not to overextend McNabbMallory ’s prophylactic rule in cases where there was a reasonable delay unrelated to [337]*337any prolonged interrogation of the arres-tee.” United States v. Garcia-Hernandez, 569 F.3d 1100, 1106 (9th Cir.2009).
As a result, the McNabb-Mallory doctrine tolerates delays related to legitimate law enforcement procedures, such as the administrative booking of the arrestee; coordinating with multiple law enforcement agencies or with the U.S. attorney’s office; or verifying alibis. See, e.g., Mallory, 354 U.S. at 454, 77 S.Ct. 1356; Davis, 532 F.2d at 25-26; United States v. Collins, 462 F.2d 792, 795 (2d Cir.1972); Feguer v. United States, 302 F.2d 214, 251 (8th Cir.1962); Haines v. United States, 188 F.2d 546, 554-55 (9th Cir.1951); cf. United States v. Corral-Martinez, 592 F.2d 263, 268 (5th Cir.1979). Delays so that the arrestee can receive medical care and/or sober up have also long been sanctioned. See, e.g., United States v. Manuel, 706 F.2d 908, 914 (9th Cir.1983); United States v. Aman, 624 F.2d 911, 913 (9th Cir.1980); United States v. Isom, 588 F.2d 858, 862 (2d Cir.1978).
Delays arising from a shortage of governmental personnel necessary for the initial appearance and transportation thereto (such as attorneys, law enforcement, and translators) also remain acceptable. See, e.g., Garcia-Hernandez, 569 F.3d at 1106. For the purposes of determining whether there is a shortage of governmental personnel, McNabb-Mallory does not require law enforcement officers to drop everything and rush to the magistrate when doing so would imperil public safety. See, e.g., Carter, 484 Fed.Appx. at 457-58; United States v. Hensley, 374 F.2d 341, 349 (6th Cir.1967). Moreover, under Mallory-McNabb, the police are not entirely “forbidden ... to investigate crime.” United States v. Vita, 294 F.2d 524, 530 (2d Cir.1961) (internal quotation marks omitted). As such, law enforcement personnel are permitted, within reasonable limits, to investigate whether the crime occurred; search and secure a premises; and secure, confiscate, or destroy contraband before taking an arrestee to a magistrate. See, e.g., United States v. McDaniel, 441 F.2d 1160, 1161 (4th Cir.1971); Williams v. United States, 419 F.2d 740, 743 n. 6 (D.C.Cir.1969); United States v. Chadwick, 415 F.2d 167, 173 (10th Cir.1969); O’Neal v. United States, 411 F.2d 131, 136 (5th Cir.1969); United States v. Lovejoy, 364 F.2d 586, 589 (2d Cir.1966); United States v. Price, 345 F.2d 256, 261-62 (2d Cir.1965); Rogers, 330 F.2d at 538-39; Williams, 273 F.2d at 798; Mallory v. United States, 259 F.2d 796, 798 (D.C.Cir.1958). And provided that the defendant agrees to cooperate before a period of unnecessary delay, McNabb-Mallory permits officers to translate oral confessions into written confessions, and does not require officers to prematurely terminate an interview. See, e.g., United States v. Redlightning, 624 F.3d 1090, 1107-08 (9th Cir.2010); United States v. Candella, 469 F.2d 173, 175-76 (2d Cir.1972); United States v. Johnson, 467 F.2d 630, 636-37 (2d Cir.1972); Long v. United States, 360 F.2d 829, 833 (D.C.Cir.1966); Vita, 294 F.2d at 532; Metoyer v. United States, 250 F.2d 30, 33 (D.C.Cir.1957); Leviton, 193 F.2d at 855.5
[338]*338Courts also accept delays when the delays arise out of the unavailability of the magistrate. A magistrate can be considered unavailable due to a host of reasons including: a busy docket; a closed court; or other factors, such as distance and weather, that make transportation impractical, futile, and/or dangerous. See, e.g., United States v. Carter, 484 Fed.Appx. 449, 457-58 (11th Cir.2012); United States v. Lasley, No. 8:11CR19, 2011 WL 1630936, at *4 (D.Neb.2011). The prompt presentment requirement does not require a magistrate to be available twenty-four hours a day, and the government is not required to take the fastest possible route to the courthouse — -just a reasonable one. See, e.g., Van Poyck, 77 F.3d at 289; United States v. Yunis, 859 F.2d 953, 969 (D.C.Cir.1988); United States v. Mendoza, 473 F.2d 697, 702 (5th Cir.1973); Williams v. United States, 273 F.2d 781, 797 (9th Cir.1959).
Finally, in applying McNabb-Mallory, a district court should not resort to a “semanticism that obscures the facts” of a case. Leviton, 193 F.2d at 854. The overall reasonableness of a delay will vary city-to-city, case-to-case, justifieation-to-justification.6 With those basic principles in mind, we turn to Boche-Perez’s confessions.
C) Application of the McNabb-Mallory Rule
Because the McNabb-Mallory exclusionary rule concerns itself with the delay before the confession, we must examine each of the defendant’s confessions to determine whether they occurred before an unnecessary delay in presentment. The record reveals three confessions from Boche-Perez regarding the DVDs.
Boche-Perez arrived at the border at approximately 9 a.m. CBP took him to hard secondary around 9:10 a.m. CBP agents discovered the illegal DVDs in Boche-Perez’s luggage at 12:40 p.m., at which point they contacted ICE. ICE arrived at the port at 1:00 p.m., mirandized the defendant at approximately 1:50 p.m., and interviewed Boche-Perez from 1:50 p.m. to roughly 3 p.m. In that interview, Boche-Perez denied knowing that the DVDs contained illegal pornography. Nonetheless, at approximately 3 p.m., ICE contacted the U.S. Attorney’s Office to see whether they would accept prosecution of the case. The U.S. Attorney’s office accepted prosecution at 3:22 p.m. Boche-Perez’s first confession soon followed.
(i) The 4:15 p.m. Oral Confession
The first confession occurred at approximately 4:15 p.m. After securing prosecution with the U.S. Attorney’s office, ICE turned Boche-Perez over to a CBP agent to process him for immigration purposes. The CBP officer began the interview to process him for immigration purposes at 4:00 p.m., gave Miranda warnings at 4:13 p.m., and Boche-Perez quickly confessed at approximately 4:15 p.m.
Because the district court found that the six-hour safe harbor ran from 9:10 a.m., and the Government does not challenge that determination, we assume that the six-hour harbor safe harbor expired at 3:10 p.m. Accordingly, when applying the McNabb-Mallory doctine, we need to determine whether the roughly seven hour delay before Boche-Perez’s first oral confession was reasonable in light of the totality of the circumstances. We conclude that it was.
First, we agree with the district court’s finding that there is “simply no” evidence [339]*339that “the delay was for the purpose of attempting to extract a confession.” The delays that resulted before Boche-Perez’s confession occurred not because of some effort to extend his detention for the purpose of interrogating him, but rather because of the need for, and the difficulties inherent in, coordination between “the remote law enforcement agencies and agents” working at one of the busiest ports of entry on the Mexican border.
The initial portion of the delay, from 9:10-12:40, and then from 12:40-3:00, was attributable to (1) routine administrative processing and search procedures at the border, (2) travel time for the officers responsible for investigating the crime, and (3) to determine whether any crime had occurred. All three types of delay have long been considered reasonable under McNabb-Mallory case law, and they were especially so in this case given that the DVDs in question were not even discovered until 12:40 p.m. See, e.g., Garcia-Hernandez, 569 F.3d at 1106; Corral-Martinez, 592 F.2d at 268; Collins, 462 F.2d at 795; McDaniel, 441 F.2d at 1160-61; Mallory, 259 F.2d at 798.
The next portion of the delay, from 3:00-3:22 p.m., occurred because of ICE’s need to consult with the AUSA as to whether criminal charges could be filed. Again, such delays have long been sanctioned by courts applying McNabb-Mallory. See, e.g., Davis, 532 F.2d at 25-26.
The final portion of the delay, from 3:22-4:15 p.m., had two causes, both of which were sufficient to justify delaying Boche-Perez’s presentment. First, at the time he had confessed, ICE had not completed, and the AUSA had not reviewed, a criminal complaint for Boche-Perez. The ICE agent justified the delay during the suppression hearing by explaining that, after receiving the AUSA’s agreement to prosecute the case at 3:22 p.m., he did not believe that he could complete the complaint in time for the local U.S. Attorney’s 4:00 p.m. deadline for criminal complaints. As such, the criminal complaint was not submitted to the U.S. Attorney’s office until the next day, and Boche-Perez was not presented to the magistrate until two full days had passed from when Boche-Perez was first placed in hard secondary.
Though ICE’s inability to submit a criminal complaint to the U.S. Attorney by 4 p.m. had the unfortunate effect of delaying Boche-Perez’s presentment by almost 24 hours from when it otherwise would have oecured, the length of the ultimate delay does not affect the McNabb-Mallory analysis of Boche-Perez’s 4:15 p.m. oral confession. McNabb-Mallory examines the reasonableness of the delay at the time of confession, not the time of presentment. Accordingly, rather than focusing on the effects that the failure to have completed a complaint by 4 p.m. had on Boche-Perez’s time of presentment, we consider whether it was reasonable to have delayed his presentment past 4:15 p.m. because a complaint had not been completed by that time.
That delay was reasonable: a review of the complaint suggests that it was fair for the ICE agent to spend at least thirty minutes preparing the complaint — the McNabb-Mallory doctrine does not require government agents and lawyers to act with such haste that they omit proofreading their court filings — and also fair for the relevant U.S. attorney, even though not instantly available, to insist on reviewing and approving the complaint before it was filed in court.7 Cf. Davis, 532 F.2d at [340]*34025-26; Collins, 462 F.2d at 795; Haines, 188 F.2d at 554-55. It was reasonable for the entire process of preparing and approving the complaint to take at least an hour. As such, Boche-Perez’s presentment had not been unreasonably delayed by the time he confessed because the relevant governmental personnel had not had sufficient time to prepare the paperwork necessary for the initial appearance.
Second, and in the alternative, even after the U.S. Attorney’s office had approved prosecution at 3:22 p.m., Boche-Perez still had to be administratively processed for immigration purposes and paroled into the United States. Boche-Perez takes exception to the fact that some of the questions from the CBP agents concerned the DVDs and not just his immigration status, but his arguments ignore that his possession of the DVDs also had significant implications for his immigration status.
Under 8 U.S.C. § 1101(a)(13)(C), an “alien lawfully admitted for permanent residence in the United States” — such as Boche-Perez — “shall not be regarded as seeking an admission into the United States for purposes of the immigration law unless the alien ... has engaged in illegal activity after having departed the United States.” Boche-Perez’s possession of the DVDs provided clear and convincing evidence that he had engaged in an illegal activity after having departed the United States. CBP officials were accordingly entitled to question him about the DVDs in light of their potential implications for Boche-Perez’s immigration status. See, e.g., Gonzaga-Ortega v. Holder, 736 F.3d 795, 803-04 (9th Cir.2013). It was reasonable for presentment to be delayed for administrative processing by an hour or so to parole Boche-Perez into the United States. See, e.g., United States v. Garcia-Hernandez, 569 F.3d 1100, 1102, 1106 (9th Cir.2009) (delay to administratively process at the border and determine whether to file criminal charges was reasonable); United States v. Collins, 462 F.2d 792, 795-96 (2d Cir.1972) (delay for administrative processing was reasonable); United States v. Fontane-Medina, No. 11-20492-CR, 2011 WL 6826811, at *19-*21 (S.D.Fla. Nov. 27, 2011) (delay to determine immigration status was reasonable).
Boche-Perez raises two objections to the reasonableness of the immigration processing. First, he objects to the idea that he was asked questions at all after the U.S. Attorney’s office decided to prosecute. However, as long as the delay was not for the purpose of interrogation and was reasonable, as the district court expressly found here, the McNabb-Mallory doctrine does not institute a flat ban on asking any questions. See, e.g., Carter, 484 Fed.Appx. at 457-58; Redlightning, 624 F.3d at 1107-08; Yunis, 859 F.2d at 955-57, 967-69; United States v. Purvis, 768 F.2d 1237, 1239 (11th Cir.1985); Collins, 462 F.2d at 795-96; Johnson, 467 F.2d at 634; O’Neal, 411 F.2d at 136; Price, 345 F.2d at 262; Rogers, 330 F.2d at 539; Mallory, [341]*341259 F.2d at 798; Yong Bing-Gong, 594 F.Supp. at 257, affd, Bing-Nam, 788 F.2d at 4; Michel, 2013 WL 686690, at *3-4; Annoreno, 2009 WL 3518155, at *4; Pena Ontiveros, 547 F.Supp.2d at 339; Haouari, 2000 WL 1593345, at *7; Berkovich, 932 F.Supp. at 587-89; cf. McDaniel, 441 F.2d at 1161. And because Boche-Perez was provided Miranda warnings, and confessed so quickly after immigration processing began, this is not a case where we need to explore the outer-boundaries of pre-arraignment questioning under McNabb-Mallory during periods of otherwise reasonable delay.
Second, Boche-Perez objects that our determination runs contrary to the Ninth Circuit’s ruling in United States v. Valenzuela-Espinoza. See 697 F.3d 742 (9th Cir.2011). But Valenzuela-Espinoza is distinguishable. First, the delay from when the illegal materials were found to when the confession occurred was far longer in Valenzuela-Espinoza than here — in Valenzuela-Espinoza, the defendant was arrested at 11:15 am, and did not confess until sometime after 7:30 p.m. By contrast, Boche-Perez had only a four-hour delay between the discovery of the incriminating materials and the confession, and indeed, Boche-Perez confessed within one hour of actually being arrested. Second, Valenzuela-Espinoza indicated that delays in presentment were justifiable when caused by “the unavailability of government personnel ... necessary to completing the arraignment process.” Id. at 752. The U.S. Attorney is undoubtedly a person necessary to completing the arraignment process, and the record here indicates that presentment was delayed beyond Boche-Perez’s 4:15 p.m. confession largely because the U.S. Attorney’s office was unavailable to review any complaint that was drafted on such a tight turnaround. Third, the context for the delays is different — Valenzuela-Espinoza dealt with a morning discovery of illicit materials and a morning arrest in metropolitan Tucson. Moreover, numerous agents were present at the time of arrest, eight of whom the court determined were “available to complete Valenzuela-Espinoza’s” arraignment. Id. at 752. By contrast, Boche-Perez’s delay occurred at one of the busiest ports of entry in the country, and there has been no showing that there were surplus personnel available to review the criminal complaint, process Boche-Perez for immigration purposes, and transport him to the magistrate before 4:15 p.m. If anything, the record shows just the opposite, and it is Boche-Perez’s burden to substantiate a McNabb-Mallory violation.
In light of the totality of the circumstances, and especially given the added complications for law enforcement procedures created by the need for immigration processing at ports of entry, this case is far closer to Garcia-Hernandez, 569 F.3d at 1106, than to Valenzuela-Espinoza. Accordingly, we reject Boche-Perez’s suggestion that somehow Ninth Circuit jurisprudence compels the suppression of Boche-Perez’s confession, and we further decline to issue an advisory opinion concerning the outer-bounds of the McNabb-Mallory doctrine as applied by our circuit and the Ninth Circuit.
The totality of the circumstances, when considered under the McNabb-Mallory cases, indicates that the Government’s delay in not presenting Boche-Perez by approximately 4:15 p.m. was reasonable. Because Boche-Perez’s 4:15 p.m. confession happened during a period of reasonable delay, the district court properly denied the motion to suppress notwithstanding the lengthy delay before he was presented. Even if we assume arguendo that the delay became unreasonable at some point before Boche-Perez was presented to the magistrate, any subsequent illegality “does [342]*342not retroactively change the circumstances under which” Boche-Perez confessed. Mitchell, 322 U.S. at 70, 64 S.Ct. 896.
(ii) The 6:00 p.m. Written Confession
Boche-Perez’s second confession occurred at around 6:00 p.m. After BochePerez’s oral confession at approximately 4:15, the CBP officer began the preparation of a written confession. The CBP officer took from approximately 4:20 p.m.~ 5:10 p.m. to prepare the statement. Boche-Perez then reviewed the statement, and signed the written confession at 6:00 p.m.
That delay was also reasonable. Reasonable delays for transferring an oral confession into writing do not trigger a McNabb-Mallory violation. See, e.g., Davis, 532 F.2d at 25-26; Candella, 469 F.2d at 175-76; Johnson, 467 F.2d at 636; Long, 360 F.2d at 832-33; Vita, 294 F.2d at 532; Haines, 188 F.2d at 554-55; Delamarra, 275 F.Supp. at 4-5. As the D.C. Circuit observed in Metoyer v. United States:
[T]he real thrust of the objection goes to the very rendering of the confession to written form. This is an attack upon a fundamental concept of the law that has always favored and encouraged the writing of freely expressed declarations which are known to be of crucial importance in order to minimize litigation and disputes as to just what was said. Delay does not mean mere passage of time; it means passage of time during which that which should and could be done is not done.
250 F.2d at 33. Moreover, even if the delay for translating Boche-Perez’s oral confession into a written confession was unreasonable under McNabb-Mallory, any error was harmless. Boche-Perez’s 6:00 p.m. written “confession overlapped in material respects” with his 4:15 p.m. oral confession and as such, any error is necessarily harmless. United States v. Mansoori, 304 F.3d 635, 662 (7th Cir.2002); see also Carter, 484 Fed.Appx. at 457-58; United States v. Ragland, 434 Fed.Appx. 863, 869 (11th Cir.2011).
(iii) The 9:00 p.m. Oral Confession
Boche-Perez’s final confession occurred at 9 p.m. when he confessed to the ICE agent that he possessed additional illegal pornography at his home in Arkansas. We decline to address Boche-Perez’s arguments because the record is hazy and even if we were to determine that the confession should have been excluded under McNabb-Mallory, any error would be necessarily harmless (under any standard of review) with respect to the offense to which Boche-Perez pleaded guilty. He had already twice confessed to that crime, and his earlier confessions were admissible under the McNabb-Mallory doctrine. Though Boche-Perez did confess to additional criminal activity in his 9:00 p.m. interview, he cannot show any prejudice in this particular case from the district court’s refusal to suppress the confession because (1) he did not plead guilty to any of those additional offenses, and (2) the district court declined to consider the additional evidence that the government seized following the third confession at BochePerez’s home in Arkansas with respect to sentencing. As such, we do not consider his allegation of error.
2) Voluntariness
Boche-Perez also challenges the voluntariness of his three confessions. To determine whether a confession is voluntary we consider the totality of the circumstances pursuant to 18 U.S.C. § 3501(b). Cantu-Ramirez, 669 F.3d at 625-26. The factors used in this assessment are the length of time between arrest and before [343]*343arraignment, whether the defendant was aware of the potential charges against him when he gave his statement, whether he was apprised of his rights, whether he had counsel, whether the delay was for purposes of interrogation, and whether the interview was “hostile.” Id. at 625-27; see also Bustamante-Saenz, 894 F.2d at 120.
The totality of the circumstances shows that Boche-Perez’s statements were voluntary even though he was not presented to a magistrate judge until two days after his detainment. See Cantu-Ramirez, 669 F.3d at 625-27. In particular, prior to his confession, he was aware of the charges against him and validly waived his rights, and nothing in the record indicates that “the delay was for the purpose of obtaining a confession.” Id. at 626. Moreover, the 4:00 p.m. interview, during which Boche-Perez first confessed, lasted approximately one hour. The room in which the interrogation took place was large with officers walking in and out, and several other individuals were also being detained there. While Boche-Perez suggests that there was no evidence that he was given water or bathroom breaks, he does not affirmatively state that he was not given adequate water or breaks, and the testimony of the agents who interviewed him indicated that he did receive both water and breaks to visit the restroom. After waiving his rights immediately before the interview, Boche-Perez admitted that he knew the DVDs in his luggage contained child pornography and then signed a written statement to that effect. Although Boche-Perez was handcuffed during the interview, there is no evidence that his interviewer or any other agent threatened Boche-Perez or promised him anything. See United States v. Cardenas, 410 F.3d 287, 295 (5th Cir.2005) (“Such basic police procedures as restraining a suspect with handcuffs have never been held to constitute sufficient coercion to warrant suppression.”). As such, the district court did not err in concluding that the delay did not result “in an interrogation that was so ‘lengthy, hostile, or coercive,’ that it would tend to overwhelm [Boche-Perez’s] will” and result in an involuntary confession. Cantu-Ramirez, 669 F.3d at 627.
3) Miranda
Finally, Boche-Perez tries to suppress his 9 p.m. confession on the grounds that he was not read his Miranda rights directly prior to the interview. This argument is without merit. By 9 p.m. BochePerez had already waived his rights twice, and he has not challenged the voluntariness of his waivers. Additional warnings were not required. See Soffar v. Cockrell, 300 F.3d 588, 592-93 (5th Cir.2002) (en banc).
CONCLUSION
We AFFIRM the district court.