Wyo. Stat. § 33-18-103: Records; information to be posted.

Every person, firm or corporation engaged in the buying and selling of junk metals, rags, rubber, or waste paper as described in W.S. 33-18-101 shall at all times keep posted, conspicuously in the office of their [his] place of business, the description of, and amount of junk articles purchased each day, and the names and addresses of the parties for whom said purchase was made, and also the names and addresses of all to whom sales of junk metals are made.