I think this is a civil stuation, not a criminal one, and the police won't do anything. I think you need a civil litigator ASAP. Hopefully you've got a written contract to buy this house, so you can sue for "specific performance," because oral contracts to buy real property aren't enforceable due to the Statute of Frauds which require those kinds of contracts to be in writing.
But even without an enforcebale contract to buy the property, you should still be able to sue for fraud to get your money back and for "conversion" to get your personal property back. Maybe it won't come to a lawsuit if you get a lawyer to threaten one effectively.
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Here's the thing:
It IS a civil matter but it IS a crime. It is not OK to defraud someone and steal their stuff and dollars to donuts if you were a corporation the cops would be all over it. Essentially, our government now gives corporations more protection than individuals. It reminds me of when they used to go to someone's home on a domestic violence claim and say, "this is a family/private issue not a crime." After many years of bad PR and lots of noise from the community a lot of that has changed. So, if I were you I would shout to to the rooftops at anyone who would listen, including the local police, the FBI, the postal service, the attorney general, the district attorney, local news etc, and see if it is indeed a civil matter or a crime. If he went to your home and took the stuff it would be a crime. I say this is a crime and I think you should make a lot of noise.
Lastly, yes, an atty would charge you a lot of money for this so, that is not a good way to go. Small claims court is a relatively fast option and starting Jan. 1, you can bring a claim there yourself for up to 10K but, as noted above, I would scream bloody murder to the hilltops here...