Wyo. Stat. Ann. § 34-1-125

The certificate of purchase or payment issued by the receiver of any land office of the United States, or the record thereof, or if the same be lost or destroyed or beyond the reach of the person entitled thereto, secondary evidence of its contents, is proof of the title to the lands described therein, equivalent to a patent against all except the United States or the holder of a patent from the United States.