that's the one i saw too.
doesn't make sense a pre facelift model being younger than facelift models, such as this facelift 2006 06 plate, as opposed to the one you linked 2006 56 plate:
http://www.pistonheads.com/sales/757125.htm
i'm not saying it's not genuine, but just seems very strange. i would have thought nissan/dealer would pre register it prior to facelift model, unless someone forgot or it was an old model left in showroom, containter, dock etc etc.