I'd say, as long as you got the car registered in your name without any trouble, don't sweat it. That is, as long as YOU are happy with it. I don't think you gave too much for it, even if it may have been misrepresented. Only you can make the determination if that's "ok" with you or not. Now, if the VIN on the door doesn't match the rest of the stamped areas, that would kinda upset me. I mean, then if you ever decide to sell, it could be tough.