Do a google search on "Unclaimed Money Michigan". Of course using your own state. There will be some commercial sites that show up, be sure to go to the site that shows up in your state
www.michigan.gov
My wife and nephew both had PayPal accounts they forgot about and were able to claim the funds. It's an easy process. There are companies that will do this for a commission, you don't need them. This is a free service most, if not all states provide.
I search my state site ever couple of years, found several hundred dollars in a bank account that belonged to my Mom. You can make a claim for deceased relatives as well, but I've never done so.