Grey dwarf hamster with pink harness missing

I lost my grey dwarf hamster, Nibbles, yesterday around 3pm. He’s a tiny ball of fur, about the size of a ping-pong ball, with a soft grey coat and a white belly, and he wears a pink harness with a small silver bell. There’s a tiny white dot behind his left ear that’s easy to spot if you’ve seen him before. We were in the Walmart parking lot on Florence Boulevard when I realized the carrier was empty, and I’m really worried—Nibbles is a rescue and means the world to me. If you’ve seen him, please message me here; I’ll rush over with his favorite veggies and a cozy towel.