KAO has 3 boxes:
Costume box, Decoration box, Mount box.
Costume box gives a random costume, it will GUARANTEED give you a costume, out of all the old costumes available (latest outfit is always in it's OWN box).
Decoration box gives you a random wing set or lolcat bag. Except the LATEST wings, all older wings are in this box. You will guaranteed get a wing set or lolcat bag.
Mount box will gives you, guess, a random mount from UA Raptor, UA Tiger, UA Elephant, Armed Elephant, Armed Raptor, Armed Tiger, Mercury Rider, Griffin and Unicorn. I'm not sure if the Mars or Hydra are in there yet. Similar to all others, guaranteed mount but not the latest. Latest are always in it's own lolbox then they get 'rotated' into the global box.
I do hope we get these boxes...