Correct. IN the eyes of the law he didnt do anything wrong or illegal to you. You simply didnt check the car out enough that is your fault not his. Its BUYER BEWARE not SELLER BEWARE. No one forced you to trade.
The fact hes being an asshole on HT, well thats not illegal either, merely just a typical douchebag.
the papers you posses however, doing anything with them besides returning them, is illegal (if you catch my drift). Id do what QD says and see what his response is





