So imagine finding out the State of Michigan might be holding onto money or property that already belongs to you. According to a press release from the Michigan Department of Treasury, nearly 1 in 7 Americans has unclaimed property. Michigan even has an official Unclaimed Property website. How to Check Michigan’s Unclaimed Property DatabaseA surface completely covered in American paper currency of all denominations. National Unclaimed Property Day is February 1, which is a weird thing to celebrate, but a great excuse to see if Michigan owes you money.