Mich. Comp. Laws § 567.230

Sec. 10. Except to the extent otherwise ordered by the court or administrative agency, any sum that a business association has been ordered to refund by a court or administrative agency that remains unclaimed by the owner for more than 1 year after it became payable in accordance with the final determination or order providing for the refund, whether or not the final determination or order requires any person entitled to a refund to make a claim for the refund, is presumed abandoned.