19 CFR §122.136

1. (a)Preparation. Two copies of a serially numbered outgoing stores list shall be prepared by the airline for all liquor and tobacco withdrawn from bonded or non-tax-paid stock and added to liquor kits. The outgoing stores list shall show the total number of bottles for each type liquor, the brand, and the size of each bottle.
2. (b)Use of copies. The two copies of the outgoing stores list shall be used as follows:
   1. (1)One copy shall be placed and kept in the outgoing kits until the aircraft leaves the U.S.; and
   2. (2)One copy must be filed either with the outgoing cargo manifest (for aircraft required to clear) or with Customs before departing, as provided in § 122.133(c).