19 C.F.R. § 182.21 Certification of origin for goods exported to Canada or Mexico.
(a) Submission of certification of origin to CBP. An exporter or producer who completes a certification of origin for a good exported from the United States to Canada or Mexico must provide a copy of the certification of origin (written or electronic) to CBP upon request.
(b) Notification of errors in certification of origin. An exporter or producer who completes a certification of origin for a good exported from the United States to Canada or Mexico and who has reason to believe that the certification contains or is based on incorrect information must promptly and voluntarily notify every person, in writing, to whom the certification was provided of any change that could affect the accuracy or validity of the certification. Notification of an incorrect certification must also be given either in writing or via a CBP-authorized electronic data interchange system to CBP specifying the correction in accordance with § 182.124 (see §§ 182.123 and 182.124).
(c) Maintenance of records—(1) General. An exporter or producer who completes a certification of origin or a producer who provides a written representation for a good exported from the United States to Canada or Mexico must maintain, for a period of at least five years after the date the certification was completed, all records and supporting documents relating to the origin of a good for which the certification of origin was completed, including the certification or copies thereof and records and documents associated with:
(i) The purchase, cost, value, and shipping of, and payment for, the good or material;
(ii) The purchase, cost, value, and shipping of, and payment for, all materials, including indirect materials, used in the production of the good or material; and
(iii) The production of the good in the form in which the good is exported or the production of the material in the form in which it was sold.
(2) Method of maintenance. The records referred to in paragraph (c) of this section must be maintained as provided in § 163.5 of this chapter.
(3) Availability of records. For purposes of determining compliance with the provisions of this part, the records required to be maintained under this section must be stored and made available for examination and inspection by a CBP official in the same manner as provided in part 163 of this chapter.