I'm about to sell my P40+ kit if you interested. All bought from a phase one dealer and very well looked after.
Phase One AF, 80mm lens plus P40+ Back
I also have a 45mm 2.8 P1 lens which is a great copy
and 75-150mm Mamiya 4.5 again a good copy
I'd love to trade but I'm in the UK and the import tax on your D800 would kill me. however if your interested let me know and I'll get the shutter counts and some pics over to you. I was looking for £6k for the Kit, £1100 for the 45mm and £1000 for the 75-150mm.
I've sent plenty stuff over to the US before ,you can check previous posts I sold a bunch of RZ equipment (which I still regret!)