19 C.F.R. § 191.36
(a) General; application. Merchandise which has been exported without complying with the requirements of § 191.35(a) or § 191.91 of this part may be eligible for unused merchandise drawback under 19 U.S.C. 1313(j) subject to the following conditions:
(1) Application. The claimant must file a written application with the drawback office where the drawback claims will be filed. Such application shall include the following:
(i) Required information.
(ii) Written declarations regarding:
(iii) A certification that the following documentary evidence will be made available for Customs review upon request:
(A) For the purpose of establishing that the imported merchandise was not used in the United States (for purposes of drawback under 19 U.S.C. 1313(j)(1)) or that the exported merchandise was not used in the United States and was commercially interchangeable with the imported merchandise (for purposes of drawback under 19 U.S.C. 1313(j)(2)), and, as applicable:
(1) Business records prepared in the ordinary course of business;
(2) Laboratory records prepared in the ordinary course of business; and/or
(3) Inventory records prepared in the ordinary course of business tracing all relevant movements and storage of the imported merchandise, substituted merchandise, and/or exported merchandise; and
(b) Customs action. In order for Customs to evaluate the application under this section, Customs may request, and the applicant shall provide, any of the information listed in paragraph (a)(1)(iii)(A)(1) through (3) of this section. In making its decision to approve or deny the application under this section, Customs will consider factors such as, but not limited to, the following: