One thought - if/when the squatter leaves the house for any reason, immediately change the locks and not allow him back inside... Then move in, toss out everything onto the front lawn and go from there..
the problem is, El Squatto has the law on his side. He can come back with the sheriff and you'll be evicted from your own house and charged with theft if anything's missing. That's what's wrong with this whole thing - the law protects the criminal and screws the honest man.
