Black Box
The Black Box is a mysterious item referenced in Kingdom Hearts χ Back Cover.
Story
Kingdom Hearts χ Back Cover
Luxu is tasked by the Master of Masters to keep the contents of the Black Box a secret from the other apprentices and deliver it to an undisclosed location.
Luxu later passes through the Keyblade Graveyard, lugging the Box behind him. Close observation of the box reveals that it contains thirteen locks - three on its left side, three on its right side, and seven on the front with the lock in the middle being slightly larger.
Kingdom Hearts III
SPOILER ALERT!! Maleficent appears to be searching for the black box along with her subordinate Pete. The box is mentioned again in The Carribean world when Luxord, a member of the real Organization XIII reveals his duty to find it. Though he admits that he does not know what the box actually looks like, he does infer that the box contains "Hope". This leaves Sora confused on why the Organization would be searching for it. Finally, during the epilogue, the box makes its appearance. Luxu beckons to the box and at different angles, it becomes clear through observation that the seven locks in the front have disappeared.
