19 C.F.R. § 191.74 Certification of exportation by mail.
Title 19 - Customs Duties
If the merchandise on which drawback is to be claimed is exported by mail or parcel post, the official postal records which describe the mail shipment shall be sufficient to prove exportation. The postal record shall be identified on the drawback entry, and shall be retained by the claimant and submitted as part of the drawback claim (see §191.51(a). [T.D. 98–16, 63 FR 11006, Mar. 5, 1998; 63 FR 15289, Mar. 31, 1998]
Title 19: Customs Duties
PART 191—DRAWBACK
Subpart G—Exportation and Destruction
§ 191.74 Certification of exportation by mail.