you realize these are currently worth ~ 20.2 BTC ? Why would anyone buy them off you for the same price they are on the market? Why wouldn't you just dump them yourself on the market? I'm sorry, but this isn't ebay.
If I just dump them off they will loose value and wont worth 20 but 19 why loose value when it is easier to transfer them to another user? Wouldn't you do the same if you had these shares? A bitcoin is still a bitcoin.
I'd love to do this aswell, but I don't think it would work at this marketplace at least. I'd be willing to buy them for a discount, but I don't see that here for me personally.
I wish you the best on your auction!