Wyo. Stat. Ann. § 11-22-112

Operators of all livestock markets shall keep an accurate record of the date on which each consignment of animals was received and sold, the name and address of the buyer and seller, the number and species of the animals received and sold, and the marks and brands on each animal. The records, together with the gross selling prices, commission and other care, handling and sales charges on each consignment shall be available for inspection by the executive officer of the board, his deputy or authorized inspector. A copy shall be supplied to the owner of the livestock. All records of sales during preceding months shall be kept readily accessible for immediate examination.