get seller to provide you a copy of title (both sides) and pencil rub of vin plate off door frame. vin rub should match title vin and title should have the word Original at top. Owner's name(s) on title should be same as seller. or both front and back title signature(s) should match owner(s) names on title. If not ask why? Also if liens are listed on title, they need to be cleared (paid and released) for car sale to be clear for you. If these items are a problem for the seller to provide, walk away from the deal. If title is salvage one, also walk away. Lastly ask when plates and inspection expire, that will tell if car is currently drivable legally.