Repossession Affidavit. Lienholders use this form to report repossession of a vehicle or vessel.The sale must be held within 90 days of repossession. You must be notified of the time and place of the sale. Use the Repossession Affidavit template to create a document without hassle and in minutes. Seller shall sell and convey to Buyer, and Buyer shall purchase and acquire from Seller, upon and subject to the terms and conditions set forth in this. You don't have a right of repossession unless the paper work reserves a security interest in the trailer, in the event of default. NOTE: Fill in the date in the following two lines only if there is an early cash out date on the assumed obligation. A Washington motor vehicle bill of sale is one of several documents you will need when registering your new vehicle in the state. Filling out a Washington Bill of Sale form is an important step in documenting the sale and transfer of property between two parties.