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The issue of what is NOS comes up very often here and on other forums. I think the general consensus is it is an object that has never been sold retail and has never been used before. You see this...

If you are selling a razor as NOS, the item in a sealed package potentially will get you the best price. Once you unseal it, it's just your word it's NOS. Of course if you buy it and pay top dollar...

Really not that unusual. There are plenty like that sitting in folks basements and garages just waiting for the right moment. Some of those wrappers are torn in places so you never know what lurks...