Section 10.907 - Maintenance of records(a)General. An importer claiming preferential tariff treatment for a good imported into the United States under § 10.903(b) of this subpart must maintain, for a minimum of five years after the date of importation of the good, all records and documents that the importer has demonstrating that the good qualifies for preferential tariff treatment under the PTPA. These records are in addition to any other records that the importer is required to prepare, maintain, or make available to CBP under Part 163 of this chapter.(b)Method of maintenance. The records and documents referred to in paragraph (a) of this section must be maintained by importers as provided in § 163.5 of this chapter.