WOW Gold there should be two authentication keys. For the Wrath of the Lich King Expansion set

,WOW Gold Cheapest

And for the wow Battle Chest, there should be two authentication keys. For the Wrath of the Lich King Expansion set

your authentication key should be located on the front of your manual if you have a collector's edition

or on the front of the paper sleeve of the DVD if you have a Standard Edition. f you receive a message "your authentication key has already been claimed"