Gray and white hamster, lost near Dayton Main Library

I lost my gray and white Syrian hamster, Mini Furball, yesterday around 3pm after I opened his cage to give him a treat. He's a tiny fluff-ball about the size of a plum, with a soft sandy-gray back and a stark white stripe running down his back. He has a tiny black dot behind his left ear and a pink paw that shows when he's excited. I last saw him near the Dayton Main Library on Main Street; I think he slipped through a crack in the door between the cafe and the bookstore. He has been with me since he was a baby and means the world to me—really hoping someone spotted him and can get him back to me.