Ok, I will give it a shot. As a Car Dealer here in Utah- all you need is proof of insurance
(the paper) they dont really verify insurance. I would however call (or go in) the dealership talk to the General Manager and ask when the car was bought, the insurance this man provided etc.. I really dont know if you can fault the dealership-- if they got proof of insurance from him @ the time of the sale-- that is really all they are obligated to do.
Is your insurance company going to go after this person? Do you have uninsured motorist insurance? Have you talked to this person to see if he has any assets? I am thinking depending on what your medical bills are etc.. and if this other person is a kid or broke or what you may be SOL-- and you may have to hire a attorney to sue him--- however depending on the amount of $$ your talking about you can sue him in small claims court.