Chapter 1: General Registration Information. A notarized bill of sale is a document that records the legal transfer of any type of personal property (vehicle, boat, etc.) from a seller to a buyer.A notarized bill of sale should include details about the property being sold (e.g. How do I fill this out? Learn about bills of sale in California for animals, vehicles, firearms, and more. Here is a step-by-step procedure to perform a proper notarization: Step 1: Personal appearance is required. Do you need a notary to sell a car in California? While not a legal requirement, having a motor vehicle bill of sale (form REG 135) is crucial in protecting your rights and interests in the state of California. How to fill out the Notarized Motor Vehicle Bill of Sale? Federal and state law require the mileage of the Vehicle to be provided upon transfer of ownership.