045-10 Wyo. Code R. § 10-11
Each proposal should be submitted in a special envelope furnished by the Department. The blank spaces of the envelope shall be filled in correctly to clearly indicate its contents. When an envelope other than the special one furnished by the Department is used, it shall be of the same general size and shape and be similarly marked to clearly indicate its contents. When sent by mail, the sealed proposal shall be addressed to the Department at the address and in care of the official in whose office the bids are to be received. All proposals shall be filed prior to the time and at the place specified in the invitation to bids. Proposals received after the time for opening of bids will be returned to the bidder unopened. Failure to properly identify a project on the proposal envelope as required by this section will be corrected at the time of opening the proposals by examination of the contents of the envelope and placing the proposals for each separate project in an individual stack prior to reading any bids.
045-10 Wyo. Code R. § 10-11