Hug up to somebody at your local DMV who you think might help. Explain to them what you're trying to do. You'd be surprised how the truth works. Tell them you're not trying to find out any sensitive information, but only trying to trace the car back to Doris Day. All they would need to do is look in their system and tell you where the car came FROM. Then, you have the next step in the saga. .....and don't say you know where the car came from, because unless you've checked, you don't.