Wis. Stat. § 842.28: Securities, how taken.

When any security is directed to be taken by the court or any investment to be made, or any security taken by a sheriff on the sale of any real estate, as heretofore directed, except where provision is made for taking the same in the name of any known owner, the bonds, mortgages or other evidences thereof shall be taken in the name of the clerk of the court in whose office the original complaint was filed and the clerk’s successors in office, who shall hold the same by virtue of his or her office and shall deliver them to his or her successor.