Michigan Compiled Laws, Chapter 570. Liens § 570.547

Sec. 7. If a customer does not claim possession of the special tool within 120 days after the date the end user receives the return receipt of the notice sent under section 5,  1 or does not make other arrangements with the end user for storage of the special tool within the time limit set forth in this section, all rights, title, and interest of the customer in the special tool shall be transferred by operation of law to the end user for purposes of destroying the special tool. This section shall not be construed to affect a right of a customer under federal patent or copyright law or any state or federal law pertaining to unfair competition.