Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.2516

Sec. 2516. A custodian of a will or codicil or person having possession or care of a will or codicil shall forward it to the court having jurisdiction with reasonable promptness after the death of the testator either by delivering it personally or by sending it properly addressed by registered mail. A person who neglects to perform this duty without reasonable cause is liable for damages that are sustained by the neglect. A person who willfully refuses or fails to deliver a will or codicil after being ordered by the court in a proceeding brought for the purpose of compelling delivery is guilty of contempt of court and subject to the penalty for contempt.