Oh, what a marvel! (salivating...)
Vintage Amouage is fantastic. Gold is perhaps my favorite perfume, a humongous floral oriental - and vintage must be even stronger. If you've never worn cologne, this will hit you like a punch. You should keep it and pass this on to your kids -this is wonderful stuff.
That said, as for selling, new Amouages go for $300. As said, vintage is even better, and you have the whole packet, but the market for vintage Amouages isn't that large as for other famous perfumes, so it is somewhat harder to pull out these amounts, though I think this bottle well deserves it. (If you look at ebay, note that the prices you see are not necessarily what one will get - one should look at actual, completed transactions). Hard to say therefore what this will get you - it'll be very variable. That's another reason for thinking carefully before offloading it.
Lack of the wrapping isn't an issue. This way you can actually show the inside. If you do post, make sure to say that the frag has been always kept in the box, in a dresser or wherever. The biggest problem for frags is light, so the fact that it has not been exposed to light will guarantee good quality. Heat can also damage frags, so that's why you should say that it has been kept in a closet or a cool place as well. Also, put a high minimum price - if it goes away for a small amount, it'll really be a shame.