The police commissioners of such municipality shall sell at public auction any articles which it acquires as provided herein after the expiration of the time for the owner or finder to demand the same and after the time and place of such sale and a description of the articles to be sold have been advertised once a week for two successive weeks in a newspaper having a circulation in such municipality. The net proceeds from such sales and the unclaimed net proceeds from the sales of perishable or obnoxious property or articles of a dangerous or harmful nature shall be paid to the treasurer of such municipality, who shall deposit them in the police benefit fund, if any, of such municipality.