Tan-and-white guinea pig missing

I lost my tan-and-white guinea pig yesterday around 3pm near the Target on West Wisconsin Avenue in Appleton. He's a shy little guy, about the size of a soda can, with a tiny white patch on his belly and a small notch on his left ear. He answers to the name Mochi, and has a soft squeak when you pick him up. I've had him since he was a baby and he means the world to me—this little guy has sentimental value and I'm really hoping he turns up safe. If you've seen him, shoot me a message and I can swing by to pick him up as soon as possible. I’d be grateful for any help.