How do I get the pre-order items?

The mog cap and the cait sith doll? I entered my pre-order code on the pre-order website, enter the code on my ps3, and go in game, and people say if you see an envelope then it's in the mailbox, but I don't see an envelope and I don't know where the mailbox is.

Please help, really appreciated =o)

~Harem