Wis. Stat. § 891.12: Land office receipt.

The receiver’s receipt or certificate of purchase of public lands, signed by the receiver, and the official certificate of any register or receiver of the entry or purchase of any land or the location of any land by any land warrant shall be received, when held by the original claimant, or the original claimant’s heirs or assigns, as presumptive evidence that the title to the lands therein described passed to and is vested in the person therein named, or the named person’s heirs or assigns, except when, at the time of such entry or purchase, the land was owned or occupied by any person as mineral ground on which discoveries of mineral ores had been made.