If you're looking to sell, put it on ebay starting at a $1 and see where it ends. I'd guess in the $400-500 range.
If you're looking to buy, why do you give a shit what I think it's worth? I'm gonna open it anyway, so I'd not pay any more than what a nice open copy would cost, but pay whatever it's worth to you.
If you're asking just for some e-dick waving about the awesomeness of your 1337 collection, nobody gives a f*ck.