Michigan Compiled Laws, Chapter 487. Financial Institutions § 487.721

Sec. 1.(1) Subject to subsection (3), if 2 or more persons rent a safe deposit box or compartment, any 1 of them, or the survivor or survivors of them, unless it is otherwise provided in the safe deposit box or compartment rental agreement, has a right to all of the following:

(2) The safe deposit and collateral company, bank, industrial bank, trust company, or other lessor of the safe deposit box or compartment is protected against all renters of the safe deposit box or compartment, their assigns, heirs, executors, and administrators in recognizing the rights described in subsection (1). However, subsection (1) does not effect a transfer of title to any contents of a box or compartment from 1 renter to another.

(3) The survivor or survivors of a renter who died before October 1, 1993 has no right of access to the safe deposit box or compartment until the provisions of section 9 of the Michigan estate tax act, Act No. 188 of the Public Acts of 1899, as amended, being section 205.209 of the Michigan Compiled Laws, has been complied with.