Gray dwarf hamster with white belly

I lost my gray dwarf hamster, Milo, yesterday around 3pm near the Library of Birmingham on Broad Street. He's about the size of a ping-pong ball, with soft gray fur and a white belly, and a tiny pink nose. He has a faint crescent-shaped white patch on his right shoulder and a tiny lighter patch behind his left ear—easy to spot if you see him scurrying around. He was last seen in the living room, but I worry he slipped out when the door was opened and might be hiding under benches near the canal by Centenary Square or behind The Mailbox. I really need him back; he’s part of the family and we’ll offer a small reward.