If this is about a rare item in-game to be used for an event then this is something you would have to take up with Rarebit. If it's about an in-game item you lost then you will need to /ccr it in-game.
As for the "one of the cats with a burning eyeball"... I can only say purple monkey dishwasher. What are you on about?
COATS....OMG cats...lol
your best option for this is to /ccr it in game.
Well, its not a game key really. the instructions tell you to go to a now non existant link and there should be a way to put in codes specifically for promotional items. Its only 8 digits long after all.