My ex currently has unauthorized possession of my vehicle. It is paid in full and titled in my name. We had a verbal agreement where he agreed to purchase the vehicle. He made a down payment and then would make monthly payments. He has not made the monthly payments. I requested the return of the vehicle based on default. He refused and has since hidden the vehicle. I sent a certified 10 day letter for unauthorized use of a vehicle requesting vehicle return, where vehicle was located so I could pick it up or pay full market value. I have not received certified return notices back yet (10 days have passed since letter was sent). I plan on filing a stolen vehicle report with police once notices are returned and vehicle is still not in my possession. If he asks for initial down payment back in return for the vehicle, do I have to give it back the funds (since he defaulted)? Can I proceed with police report for stolen vehicle?