It's very very obvious when somebody is selling stolen property on CL. No box, manuals, receipt or power adapter? Asking 25% of retail? If nothing else, there is usually some stock picture or none at all, and the spelling/grammar/punctuation are terrible. In short, "you just know."

To answer your question, if you knowingly buy stolen goods, you deserve to be punished. (I emphasize that this whole scenario is just conjecture on my part.)

Edit: also, there's a screen cap of him /erasing the other guy's account/. I mean come on ...