21 CFR § 1312.26
Records required of exporter
June 25, 2020
In addition to any other records required by this chapter, the exporter must keep a record of any serial numbers that might appear on packages of narcotic drugs in quantities of one ounce or more in such a manner as will identify the foreign consignee, along with an official record of the export permit, in accordance with part 1304 of this chapter.
[81 FR 97033, Dec. 30, 2016]