When I bought my 2800 CS (#2270335) from Claremont Auto Sales in Berkeley, California in 1989, the proprietor claimed that the car had been originally owned by George Lucas of "Star Wars" fame. When I asked for documentation, he said : "go to the DMV and ask them". Now, if you have ever dealt with the DMV you would realize how funny that suggestion was, especially 21 years ago. At that time, they were probably running on tube computers, and couldn't tell you who owned a car at present, let alone 19 years ago. I never bothered to substantiate that claim.
Still, if anyone knows whether George Lucas ever owned a silver coupe, please let me know. The car did have a sticker in the doorjamb from "PeeWee's Detailing" in Marin, so maybe.