Redditor the_sylvan posted this image today and claimed that he found the item at Goodwill. It's an apparently unopened copy of Zelda II: The Adventure of Link, the NES classic (we use the term "classic" loosely, but still).
One comment thread even diverged into determining whether the shrink wrap was real, as in not added after the game had been opened, and it seems they determined that it's legit.
So what would you do? Sell it, put it on display or open it up and play that bitch on your NES?