It could well be, however it could also turn into a huge mess if it is indeed not the vendors car to sell etc. Some more digging is clearly needed.
If I was absolutely adamant I had to have a shot silk car it might be worth a punt, I think it looks like a stunning colour but I'm not sure I'd want to own it. I have owned two monogram cars in the past, a Typhoon ZT 190 and the Bittersweet ZT-T 190, both got a lot of attention but the Bittersweet made it most difficult to drive around inconspicuously!
I like the idea of real Q car this time, under the radar, most people wouldn't look twice at it thinking it was just an old ZT. If I can't get hold of a green car I think Grey would be my next choice.
Best to phone the auction house and make your own enquiries. They don't seem to have any info on the car at present, which I found a bit odd. You can also seem from the photo's paint repairs are required. Beautiful motor though. I test drove this very car back in 2006!