The vendor made some other comments which are worth mentioning. He said that the Grande Nose parts turned up from Japan "still in their Police livery". If he could show photos of this, it would help his story. However, the only Police-specific 'livery' paint detail on an original 5-piece Grande Nose would be the white & black paint split on the headlamp cowls. The lower cowl panel would be painted black and the bonnet extension piece would also be black. The urethane front bumper on the Kanagawa Prefectural Police highway patrol Fairlady 240ZG is in its normal factory-supplied shade of metallic charcoal grey. Further, Nissan was still supplying genuine Grande Nose components in Japan right up through the 1990s as factory replacement parts. Unlike earlier factory pieces, the later items were supplied in a black gel coat finish. This would make it harder to identify "ex-Police" parts via colouring.
He mentioned that the Grande Nose parts languished in US Customs for a long time before being released, as though this was some sort of positive. I don't see how? Is he linking this to their "ex-Police" nature? Seems more likely that they were mis-described in their shipment documentation or that the receiving party didn't know how to deal with international shipment procedures and/or import duties and taxes. Kind of a bizarre detail to add to an auction description either way.
He also showed the Nissan parts boxes that the headlamp covers came in, and said that they will be supplied with the car to any buyer. So what happened to the originals that that were on the "ex-Police" parts?
Lastly, which particular "ex-Police" 240ZG did these parts come from? There was no mechanism for ex-Police cars to fall into private hands in Japan, and - so I'm told - Police-specific componentry would be stripped out for possible re-use before the cars were scrapped. Yes, stock parts could theoretically make it onto the used parts market, but where's the paper trail? The number of Fairlady 240ZGs used as Police cars was vanishingly small, so which one was it?
Here's a photo of a Fairlady 240ZG during its transformation into a Police car at (I believe) Nissan-affiliate TONOX's Tonouchi factory. I believe that this is the same car that is now in the Nissan Heritage Collection: