This is an "almost". Long 'bout 1986-7, after my first daughter was born and in daycare, I found out the sitter's son (who is few younger than me), had an X33 Z that he had bought nearly the same time I had purchased mine (3/73), and still had it. He brought the car over to my house one afternoon, and let me go over it and drive it to boot. I got the VIN with his permission and did a title search on the car through the state (doing the detective thing), and got the entire title history, dealer invoice and MSO that documented the car. Over the years he had toyed with selling the car; before I moved away from him in '92, I made one last attempt to buy the car from him, but he would not sell it at that time.
Flash forward more than several more years - I heard he had sold the car. I managed to track it down through Google, but by then the car had sold again. I tracked the new owner down through CRG and made him a present of the paperwork that documented the history and originality of the car (at no charge, the way it should be). I just wished I could have bought and kept it with me instead of just owning the paperwork !
Regards,
Steve