Wis. Stat. § 891.08

Whenever the record, in the office of a register of deeds, of any conveyance or of any instrument whatever, upon which revenue stamps may have been at any time required to be affixed by any act of congress, shall show such stamps or any of them, more or less, to have been affixed, it shall be presumptive evidence that such conveyance or instrument had properly affixed to it the number and denomination of stamps required by law.