Wis. Stat. § 170.05
If no claimant for the stray requests its return under s. 170.04 and if the stray has not been appraised at more than $10 the finder shall become the absolute owner; but if the appraised value exceeds $10 the stray shall be sold at public auction by the sheriff or any constable of the county on the request of the finder. Notice thereof shall be given and the sale shall be conducted and the same fees allowed therefor as in case of sales under ch. 815. The finder may bid at the sale and shall at the time of sale deliver to such officer a statement in writing of the finder's charges, which shall be filed by the officer with the town treasurer; and after deducting the charges, if just and reasonable, and the costs of the sale the officer shall pay one-half of the remaining proceeds to the finder and within 10 days thereafter the other half to the treasurer of the town for its use. If the finder of the stray neglects or refuses to cause the sale to be made when required by law the finder shall pay to the town the value of the stray, to be recovered in an action by the town.
Wis. Stat. § 170.05