I thought of the rear bucket seats, but, as I understand it, all the 300CEs had the Sportline-style split seats.
The steering wheel shape is a good clue. I'll take the picture from the "Featured Cars" page with me to the lot for comparison.
I'll also also look for the option codes you referenced.
In all, though, I'm pretty comfortable with the VIN trace, as the dealer who did it is unaffiliated with the lot that is selling the car.
Thanks for your thoughts,
'92 325is (sold)
'72 250C (sold)
'71 280SE Euro (totalled)