I deserve a cake for the amount of serious answers I came up with.

Tetsuya Nomura 

A note saying the official release date for KH3. 

Of course another Case!

I would imagine the Book of Prophecies is in it, but that case is too big for the book so it could be anything.

I think Chirithy, mainly because the box is overly large for the Book of Prophecies.

Maybe the next poll should be, "What's in the mysterious cases with Riku and King Mickey in the Kingdom Hearts 2.8 trailer?" I doubt that whatever's in them is the same thing but I do think it's curious how multiple characters were carrying cases in one trailer.  

Mad Eye Moody.

You thought it was a plot important thing but-

The Universal Reset Button. I mean he was standing near Kingdom Hearts' formation later in the trailer so that kind of adds up.

The thing we can't have.What we have been waiting years for. Kingdom Hearts 3

I'd guess Book of Prophecies or scattered pieces of the X-Blade.

After much contemplation, I think that the case holds the X-Blade itself, or at the very least, it's essence! I mean, the case is too big for the Book Of Prophecies or Chirithy, since both are relatively small, and I can't think of anything else that could be in there! So it could be the X-Blade, or something related directly to Kingdom Hearts in general! But honestly, I don't know!

Honestly whatever is in the case that Luxu is dragging (you can see his keyblade in one frame) it's something important and it has something to do with the Master of Masters if that X or chi super goes on with the whole seven deadly sins name and such. It could be the stuff you need to make a Chirithy or something different but like I said it's going to be something important

Kingdom Hearts...People have been theorizing that there are 20 locks on the box...13 darkness + 7 lights = X-Blade = Key to unlock Kingdom Hearts ...meaning the 13 darknesses and 7 lights unlock the 20 locks on the box or something like that...It sounds stupid to me now that I've written it. It's probably not Kingdom Hearts...

An Obscurus

Copies of KHIII. They've been hiding them from us this whole time!

Another. Firetrucking. Case.

 

Or rather, either something to make sense of the KH Plot for people who can't be asked OR more convoluted bull to say "Firetruck you, figure it out."

I think that case holds a very powerful weapon, strong enough to match the Keyblade, or even the χ-blade itself. Perhaps it can even destroy all worlds! That could be why that guy took it: to either protect the World (if he's a good guy), or destroy it (if he's a baddie).

Edited December 10, 20168 yr by Dave the Assassin

A corpse . Send that man to jail !

Not yo mama, she way too big to fit in that box.

that embarassing picture of spongebob at the Christmas party

i think thats the special x , because , i dont know what is the reasson

Chuck's dead body

its a box within a box within another box