Tuxedo cat Milo with blue collar missing near library

I lost my black-and-white tuxedo cat named Milo yesterday around 3pm. He's about 9 pounds, with a short coat, bright green eyes, a tiny notch in his left ear, and he wears a blue collar with a brass tag that says Milo. I last saw him near the Brookhaven Public Library on Main Street in downtown Southwest Mississippi; he slipped into the alley between the bookstore and the cafe. He's very friendly but skittish with strangers, and I'm really worried—he's microchipped but I don't know if the info is up to date. If anyone finds him, please contact me; I miss him a lot.