Until July, you can now pickup special rewards each time you advance your base-level.
These will be delivered to you via RoDEX in the form of a special box containing various rewards for your level. In addition to these level based rewards, players that reach 2nd Job, Trans and 3rd Job will receive extra special rewards; but this is only for the first 100 players to attain each one. These rewards are triggered by the Job Master, and again these will be delivered to you via in-game mail.
On July 1st this event will come to an end and any boxes that haven't been opened will be removed.