Yes it matters that he is in Canada. US law can't touch him there.
And even if he was in the USA, Then the other problem is what if that is all he owns and then how do you collect any money out of someone that doesn't have anything of real value? His home is exempt from attachment so if he is broke then just what do you get? Do you think you would be satisified with $50 out of his paycheck every week for the next 20 years.
Face it, He could go to Alantic City and blow the money you paid for the car and then you couldn't get anything. Most of these frauds fall into that catagory of deadbeats (That is why they are stupid enought to try to get away with it in the first place because they have nothing to loose and your money to gain)
