Mich. Comp. Laws § 445.612

Sec. 2. Unless otherwise agreed in writing, if a customer does not claim possession of a die, mold, or form from the molder within 3 years from the last use of the die, mold, or form, all rights, title, and interest in the die, mold, or form may, at the option of the molder, be transferred by operation of law to the molder for purposes of destroying the die, mold, or form.