Wyo. Stat. § 23-3-104: Coupons.

When any big game animal, trophy game animal or turkey is killed under a license, the licensee shall detach, sign and date the proper coupon and attach the coupon to the carcass before leaving the site of the kill. The coupon shall remain on the game animal or turkey carcass at all times until the meat undergoes processing, or on the trophy game animal hide until it reaches the hunter's home or a taxidermist, except that during transportation of the carcass or hide the coupon may be removed to prevent its loss. If the coupon is removed for transportation of the carcass or hide it must be in the possession of the person accompanying the carcass or hide at all times.