Police Called Me Accusing Me Of Stealing A Wallet?

US, Michigan.

I got a phone call today from the local PD claiming I had stolen a wallet when I was at the store with my mother last week. They claimed we had "fanned out money" and that they wanted the wallet back. The fanning out money was my mother giving me back some money she owed me. I told the police I had absolutely no idea about a wallet and that I was going to hang up, and he said "okay".

What else do I do? Is there a warrant or am I in immediate trouble?