D.C. Mun. Regs. tit. 16, § 1104
1104.1 Each auctioneer, immediately prior to the receipt or acceptance for purposes of sale, and before offering any personal property for sale, shall write or cause to be written in a book to be kept for that purpose in the business the following information:
1104.2 All books and entries under § 1104.1 shall be open to inspection during business hours upon application of any member of the Metropolitan Police acting under authority of the Chief of Police.