That just totally sucks, I know because it happened to me last year. Stole a nice "gravel bike" from a locked shed along with yard care equipment. I saw it for sale on Offerup about 3 months after it was stolen but it was an old ad and the bike had already been sold and the poster had moved to Oregon. Fast forward to last April, open up Craigslist and damn, there it is. Called the poster and asked if it was still for sale, which it was. Went over there with my receipt from when I bought it with the serial numbers. Fiipped the bike over and told him this was my bike, stolen from my house last August. I'm taking it if you have a problem we'll call the sheriff and let him settle it. He stuttered and stammered and said no take it take it. After I got home he texted me a picture of the Craigslist from Davis, Ca. where he said he bought it.
So even though the bike was stolen 8 months earlier always keep an eye out. The best part is the bike came back in better shape then when it left.