27 CFR 31.152: Requirements as to wines and beer.

Every wholesale dealer in liquors who receives wines, or wines and beer, and every wholesale dealer in beer must keep at the dealer's place of business a complete record showing the quantities of wine and beer received, from whom the wine and beer were received, and the dates of receipt. This record, which must be kept for a period of not less than three years as prescribed in § 31.191, shall consist of all purchase invoices or bills covering wines and beer received or, at the option of the dealer, a book record containing all of the required information. Wholesale dealers are not required to prepare or submit reports to the appropriate TTB officer of transactions relating to wines and beer.