Many players have run into an issue where the Pandora's Box mission items disappear once they leave the mission space. The mission items are supposed to be replaced at that time and our information leads us to believe that this is due to full Inventories. The system believes your Inventory is full because you have slots currently filled with the mission items.

 

Also, please be aware that the team leader is the one who will be getting all the critical items throughout the Arcs. You cannot change leaders in the middle of an Arc, either.

 

We're investigating the issue to see if this is the problem and will fix this issue as soon as possible. In the meantime, make sure you have at least three slots empty in your Inventory before you exit a Pandora's Box mission space.