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. Learn how to transfer a vehicle title in Missouri. Bill of Sale: Documents the sale and includes the purchase price, date of sale, and both parties' signatures. A Missouri bill of sale is a legal document that records the sale and transfer of personal property. It is commonly used for motor vehicles.