Board Thread:General Discussion/@comment-6986530-20131211045616/@comment-6192846-20140217115909

Looking at the actual Re_birthday, it seems like Allen/Irregular has been asleep since being placed in that box. The boy in the box wakes up in Re_birthday unaware of his surroundings, then seems to only remember what he did in life (possibly after death).

Also, since we're dealing with the god of creation, I get the impression Sickle can do anything he wants to that box. He just can't do it while in the Third Period since he imposed a rule that he'd remain only an observer. It's possible he put the black box in the Doll. We'll have to wait and see.

Based on the sound of their conversation, it seems the golden key Sickle has is different from the vessel of Wrath, unless he somehow picked up that vessel as a bat and brought it back to the Heavenly Yard (that could explain how it disappeared after the battle at the beach, if not because stolen by Abyss I.R.).