21 C.F.R. § 1312.24
The Administration shall transmit the export permit to the competent national authority of the importing country and shall make available to the exporter an official record of the export permit through secure electronic means. The exporter, or their agent, must submit an official record of the export permit and/or required data concerning the export transaction to a customs officer at the port of export in compliance with all export control requirements of agencies with export control authorities under the Act or statutory authority other than the Controlled Substances Import and Export Act. The exporter must maintain an official record of the export permit (available from the secure network application on the DEA Diversion Control Division Web site after the Administration issues a transaction identification number) in accordance with part 1304 of this chapter as the record of authority for the exportation and shall transmit an official record of the export permit to the foreign importer. The exporter must ensure that an official record of the permit accompanies the shipment to its final destination. No shipment of controlled substances denied release for any reason shall be allowed to be released from the United States without subsequent authorization from the Administration.
21 C.F.R. §1312.24