Wis. Stat. § 24.341

Whenever any claim is made for a refund on a void land sale under s. 24.34, the board shall make an investigation and determination, and offset the value of the use of the land, property removed from the land, and damage or injury to the land by the claimant, together with interest thereon, against the amounts actually paid to the state and to any other persons on account of the purchase, possession, use, damage, or injury to the lands by the claimants. The refund or payment to be made under s. 24.34 shall in no case be more than the excess, if any, of the amounts paid out by the claimant, with interest, over the offset determined under this section.