Wouldn't buying something from this guy be a crime as well?
I mean, aren’t there laws outlawing buying stolen items?
I don't know all the details and it probably varies by state, but one aspect is that it is a crime (misdemeanor) to be in "possession of stolen merchandise", but part of the process is that the person accused of that had "knowledge" that it was stolen merchandise and acquired it under those circumstances.
Half a dozen years ago there was a stir at the flea market where I sell. The police were at a vendor one row over and several spaces down from me. Turns out a customer had found several tools with his driver's license number on them at this guy's space.
Since he (the actual property owner) had reported the theft (from his garage) to the police months earlier, it was a no-brainer they were in fact his and had been stolen. Luckily the vendor had a receipt from the storage auction sale that had the locker number, etc showing he had bought the goods in good faith (had no knowlege they were stolen). We all followed this with interest from the time of the confrontation right up to the point where the vendor reported to us that the police had gone to the storage facility and talked to the mgr about the locker in question. We don't know if they ever got the guy (or his girl friend) who had rented the locker and then defaulted on it.
Meanwhile, of course any item that had the DL number on it went back to the legal owner and the vendor was out the bucks for those. He had probably sold some items prior to the discovery and smaller things wouldn't have been confiscated I would guess, though the cops were there for a good long time.