Bro if it sounds too good to be true it is. Of course they aren’t going to tell you its stolen. 🙄
Go to your local police station with info on the seller and report it. As it is you are most likely in possession of stolen property, which “a reasonable person ought to have known” was stolen. Could be part of a larger stolen goods ring, maybe your tip will help shut them down so the next person doesn’t get fucked too.