Wyo. Stat. § 34-5-107
Any conveyance of land situate within this state, for which no final proof had been made by a deceased entryman or for which no patent had been issued to such deceased entryman under the land laws of the United States during the life of such entryman, which said conveyance has heretofore been made by an executor, administrator or administrator de bonis non of such deceased, appointed and acting by the authority of an order of court of this or any other state, and any conveyance of any land situate in this state heretofore made by any such executor, administrator or administrator de bonis non of a deceased person, whether made under the provisions of any will, foreign or domestic, or any order of court, foreign or domestic, shall be valid and binding, inter alia, upon any heir or devisee and upon any successor in interest of such heir or devisee by whatever manner, in the following cases: First, when such conveyance has with knowledge or means of knowledge of such conveyance, been treated as valid by any such heir or devisee, and the successor in interest thereof, or by such successor in interest, for the period of five (5) years after such conveyance has been ordered or approved by any such court or judge thereof; secondly, when such conveyance has not been sought to be set aside in any court of competent jurisdiction within five (5) years from and after the filing of such conveyance in the office of the county clerk of the county wherein such land is situate.
W.S. 34-5-107