I don't like laughing at another man's misfortune (unless he's a turd/true hostile enemy, in which case I laugh the loudest...), but as noted here many times before, there are manifold resources with which to determine even elementary facts about a given family of weapons. This is truly the buyer's fault.
I can only hope he learns from this, and considers it tuition in the on-going curriculum of collecting. With any luck, he'll look at it like a man and know that there's far more to learn from the hard training ground of failure than the soft embrace of success.
Pat