Really depends on your state and without knowing what NJ requirements are we are just guessing.
In California after about 7-10 years of no activity they are purged out of the system and you just fill out paperwork to put it in your name including statement of facts. You don’t need any old title or registration and there’s no vin verification required.
On the flip side if it’s in the system, without a valid title or signatures from the last legal owner you are dead in the water and the vehicle is stuck in limbo. It can’t be legally bought, sold or transferred because as far as the state is concerned it still is owned by the last titled owner and they have not released it.