NOS grill outer sheel question

[Mike's money pit]

Hi,

I am looking at a grill shell for a 72 that the owner says is NOS. Is there a way to tell if the part is indeed NOS. The one on my truck is original but has several dents and scrapes. The one I am looking at is not in the original packaging.

Am I also right to assume if it is NOS it is worth more than the new repro's as long as it is in good condition?

Thanks for sharing your knowledge,
Mike