Legal Question in Criminal Law in Texas

You have a written bill of sale. Hopefully you have receipts or cancelled checks for the payments you have been making. Keep the truck and gather all your receipts together in the event that someone calls or comes to question you about it. I would also write a letter detailing the agreement, listing the payments and improvments and all the costs involved, and advising the seller that you intend to continue to make payments and that legally the vehicle belongs to you. I would also assert to the seller that if he reports the vehicle stolen or any other such action, then your position is that it is a false police report. Finally, you need to pay off the balance ASAP and be done with it.