Thought i'd post this, saw it on the dev tracker.. Think it explains why we cant get our shirts yet.

Quote Originally Posted by Bayohne View Post
As a reminder, the Chocobo Shirt code will become valid once Seekers of Adoulin becomes playable. Here's the announcement we made earlier this week on the official site!
Regarding "Chocobo Shirt" Campaign Code Registration (03/25/2013)

On March 26, 2013, the FINAL FANTASY XI: Ultimate Collection Seekers Edition will go on sale and those who purchase this special edition will also receive the Chocobo Shirt in-game bonus item. Please note that registration of the Chocobo Shirt campaign code will not be available until Seekers of Adoulin becomes playable.

*The specific time when Seekers of Adoulin content will become playable will be announced at a later date.

For those waiting for their bonus codes from their purchases on the Square Enix store, the team is aware, and is sending them out today.