Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.76108

Sec. 76108. (1) A person may recover abandoned property outside a Great Lakes bottomlands preserve without a permit if the abandoned property is not attached to, nor located on, in, or located in the immediate vicinity of and associated with a sunken aircraft or watercraft and if the abandoned property is recoverable by hand without mechanical or other assistance.

(2) A person who recovers abandoned property valued at more than $10.00 without a permit pursuant to subsection (1) shall file a written report within 30 days after removal of the property with the department or the department of history, arts, and libraries if the property has been abandoned for more than 30 years. The written report shall list all recovered property that has been abandoned for more than 30 years and the location of the property at the time of recovery. For a period of 90 days after the report is filed, the person shall make the recovered property available to the department and the department of history, arts, and libraries for inspection at a location in this state. If the department of history, arts, and libraries determines that the recovered property does not have historical value, the department of history, arts, and libraries shall release the property to the person by means of a written instrument.