If this guy is a car-curber and selling salvaged/used autos misrepresented as private sales, he may be in violation of local business licensing statutes.
I got taken by a curber when buying my first Porsche (young AND stupid, bad combination). The City had several complaints on file and went after him for operating a business without a license. I went after him in civil court and felt lucky just to get my repair costs back!
Good luck and keep us informed.