Learn about bills of sale in Pennsylvania for vehicles, firearms, animals, etc. The seller must complete all applicable information and sign this form.The Bill of Sale or Even-Trade Bill of Sale must be notarized. Learn about bill of sale requirements for the state of Missouri. Includes free Missouri bill of sale templates for cars, trucks, boats, firearms, and more. A motor vehicle bill of sale is between a buyer and a seller of a car, truck, or motorcycle. It is signed as the last step in the sales process.