I emailed the seller of the car. I asked for mileage, any prior body damage or rust, if any repairs had been made to suspension, steering, drivetrain, if the engine and tranny were original. I also asked if he had a Marti or any Ford documentation showing it was a true CS. Here's the answer I got back.
"driver decent car car is.a.known car since it was 2 years old from orig owner ..it is always known as a gtcs"
I followed up telling him I was interested, reasonably close, gave him my town and phone number, and asked again for documentation or the VIN, giving him a link to Marti Auto so he could see why I wanted the VIN. I wanted to get some provenance and a decent idea of condition before driving for 6 hours. Dead silence since. I think this one may prove to be a dead end for me.
Steve