21 C.F.R. § 1312.26
Link to an amendment published at 81 FR 97033, December 30, 2016.
Link to a delay published at 82 FR 8688, Jan. 30, 2017.
The exporter shall 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 Copy 3 of the export permit.