Dwarf hamster with white belly, missing

I lost my dwarf hamster, Niko, yesterday around 3:15pm near the Yale Bookstore on Elm Street in New Haven. He's golden-brown with a white belly and a tiny pink nose, about the size of a ping-pong ball, and he has a crescent-shaped white patch on his chest plus a small nick on his left ear. I last saw him darting toward the planters by the bookstore and he could’ve slipped into a grate behind a bench, so he might be hiding in the shrubbery along Elm Street. This little guy means the world to my daughter—my family rescued him, and he’s a sentimental part of our days; please help me get him back if you find him.