Over at GPMINI.net, I've been maintaining a list of GP roof numbers, owners and location for any GP owner that gets in contact ... I doubt we'll ever find them all, but it's still interesting to see where some of them have gone! There's lots of other GP-specific info there too (like scans of the MINI USA GP booklet)
In my recent search, I found one at Mini SF that was CPO which has recently been sold (i.e., in the past couple weeks). There's a second car at an independent dealer in Santa Cruz, CA - GP 0352: DE LAVEAGA MOTORS
I guess congratulations on your new to you GP is in order then. Looking forward to seeing it added to the Garage.