Mich. Comp. Laws § 440.9605: Unknown debtor or secondary obligor.

Sec. 9605.

A secured party does not owe a duty based on its status as secured party to either of the following:

To a person that is a debtor or obligor, unless the secured party knows all of the following:

That the person is a debtor or obligor.

The identity of the person.

How to communicate with the person.

To a secured party or lienholder that has filed a financing statement against a person, unless the secured party knows both of the following:

That the person is a debtor.

The identity of the person.