Transfer, Replace, or Change Title To prove vehicle ownership, it's important to have a valid, up-to-date, and accurate Certificate of Title. A bill of sale is a legal document that outlines the purchase of property between a buyer and seller.It commonly includes both parties' information. According to the DMV, yes you can, however the previous owner must sign the necessary forms in order for them to be valid. How do I fill this out? Steps to Filling Out Motor Vehicle Bill of Sale; Key Details about Motor Vehicle Bill of Sale; Discover Common Types of Motor Vehicle Bill of Sale Templates. To register a revived salvage vehicle, a buyer needs several state-required documents including proof of ownership. According to the DMV, yes you can, however the previous owner must sign the necessary forms in order for them to be valid. The bill of sale combined with a registration certificate may be enough to prove ownership, if a valid title isn't available. 5. The Seller agrees to deliver the Vehicle to Buyer with a current registration and a clear title.