My last recourse is to send them this e-mail.
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Dear Bioware,
I have a sad tale to tell.
Once, long ago when the world was young and games came not from digital distribution but the square CD cases of myth a young boy came across one such game. It's name was Baldur's Gate II, and it promised adventure and freedom beyond all of his dreams.
With notes of trade, pried convincingly from his father's own belt pouch, the young boy marched up to the owner of the shop, a wizard or sorcerer of mystical repute and placed his heart's desire upon the table, along with the notes of trade that he hoped would sway the old wizard's mind into letting him walk from the shop, prize in hand. The transaction completed and the boy was triumphant. He played the game for many moons, friends passing him to stare at the dream scape conjured by the artefact he had bartered. Later on in his life, he even bought another game, about a Throne of Baal which added to the artefacts power.
But as all stories say, things were not to stay the same forever. The boy grew up into a man and other games took Baldur's Gate II's place, games of a Land of Neverwinter, a Mass Effect and even an Age of Dragons. Baldur's Gate II was left, forgotton. Alone in the darkest recesses of the attic.
But it was not to end it's life there, for the boy, now a man found it once more. His eyes lit up as he remembered the power that this thing once had. Opening the case and opening the CD tray he went to place the first disk to be read, but was halted.
Out of the four disks, there was only three. Disc 2 was missing, lost to the void. The man was defeated by time and entropy. He cursed himself for losing it, cursed himself twice for his carelessness. But before he could curse himself thrice, he paused.
"I must seek out the Creators, the Keymasters, the Dream-Lords, the High Kings of Bioware. They may give me what I seek, a disc 2, so I may play Baldur's Gate II's once more. Or, they shall laugh and pity my pleas for aid."
So he divined the e-mail address through use of Google and basic internet search skills and set about writing his tale down, in hopes it would warm the hearts of the Keymasters.
How this story ends, is up to you,
The Brave Adventurer
PS: TL;DR: I lost Disc 2 of Baldur's Gate II, can I have another one please?