Sad tale..
Now..here is what i would do if i were you..
Ring up a reputable soliciter, get an opinion.Keep that in your back pocket.A first time consult should not cost you a thing, and will be cheap insurance.

Second, i would contact Gailen David, and offer to pay him to have it inspected in hand so that the authenticity can be determined yes or no.Armed with this information, you can set a course of action.

If it is bad, you can produce informed evidence in small claims court.

That is the civil way..in my old days, i would have marched right over and relieved the gent of goods with equiv. value..

This man had no intention of honouring any agreement and i would say all bets are off..do whatever you feel you have to do (within legal boundaries..) to recoup your losses..