After redeeming the code to your Age of Conan account, you should be able to redeem your items by logging in to the game and checking your Claims (as Radicaltop said). Claims can be opened from your inventory window or by using “/claim” in the chat window.
Please be aware, if you’ve just created your character you might need to relog once before all their Claims are visible and available for claiming.
If you’re not able to find the rewards in your Claims, feel free to contact us through an in-game petition and a GM will be happy to look into the matter for you. You can quickly open the help interface to submit a petition by using “/petition” in your chat window.