Quick reminder : If you pre ordered or played in the beta weekends/open beta , you got 3 boom boxes per day you logged on.
Boom boxes will be available from a special account wide cache.
Boom box items are character bound. This is important to note! So make sure the character you are playing is the one you like before opening a boom box!
Boom boxes can contain costumes, potions, special mounts etc.
Boom boxes can only be opened at a rate of one every 20 hours.
Carbine has said that they will have boom boxes available again for folks through other events.