How have certifications been introduced to verify foreign business records under the hearsay exception for abuse of discretion?

We review a district court's decision to admit evidence under a hearsay exception for abuse of discretion. United States v. Sherlock, 865 F.2d 1069, 1083 (9th Cir.1989). The district court found that the certifications offered to verify the foreign business records met the requirements for admission under section 3505. The government introduced a certification by an employee of the Singapore travel agency, executed under threat of criminal penalties for perjury in Singapore, declaring that the agency's records were prepared in the regular course of business with knowledge of the matters recorded at or near the time that those matters occurred. With respect to the hotel records, the government introduced a similar certification by the hotel manager. We hold that the district court did not abuse its discretion.