Gray Syrian hamster with white belly

I lost my gray Syrian hamster yesterday around 3pm. I had him in a small gray cage with a blue wheel and sunflower seed bedding, and he slipped out when I opened the door near the Eau Claire Public Library on Water Street. He's about the size of a golf ball, soft gray fur with a white belly, and a tiny white patch on his left ear; pink nose, big curious eyes. He's reasonably friendly once he calms, and he means the world to me--he's been part of the family for years. If you spot him, please text or call; I'm offering a small reward for his safe return.