A vehicle private sales receipt serves as formal documentation provided to a buyer as evidence of payment for purchasing a car from a private seller. This document is an acknowledgement receipt for the sale of a motor vehicle from a seller to a buyer.A vehicle private sales receipt is given to a buyer as proof of payment for the purchase of a car from a private seller. Arizona Notary Acknowledgment Form ✓ easily download and editable a document to meet your specific needs ✓ fill out and sign the PDF form online. For Arizona searches: Complete a Motor Vehicle Records Request form 46-4416. Tip: If you're using Form H-6B in place of the current Connecticut title, and there is currently a lien on the vehicle, you'll need a lien release letter.