This is very unfortunate. I am afraid without a VIN and without a title you are not going to be able to register this car. My guess is it was either a parts car or a stolen car. You could contact the original seller and tell him you need documentation with the vin that shows he owned it and it was his to sell. If he does not have that info then you could ask for your money back, which he is likely to hang up on you. At this point you could try the DMV and when they tell you it can't be registered you could report it to the Police or Highway Patrol as a possible stolen car or keep it as a parts donor car for another one that you can find to build. Although not necessarily legal or legitimate and I am not condoning this, people have put legitimate VIN panels from one car to another and no one can really prove it was done.