A car (vehicle) purchase deposit receipt is written proof that a potential buyer of a car has supplied the seller with a deposit. The proof of sale for a vehicle from a dealer is the Retail Certificate of Sale (MV-50) ("Dealer's Bill of Sale").Yes, you need a bill of sale. State the terms and odometer reading on the BOS. Optional: You may attach a voided check or deposit slip with this application. If you choose to do so, you are not required to sign the check. Fill in the vehicle details such as make, year, and registration number. Experience history, luxury and opulence at The Biltmore Los Angeles in the heart of Downtown Los Angeles. Book your room for an unforgettable stay!