(Wait for modification) "I can't determine the box's material just by looking, but there are only two possibilities for that item not fitting into the inventory. One is that the box itself cannot fit, and the other is that the contents of the box cannot fit."
"If the contents of the box can't fit into the inventory, that suggests it might be a living animal, but it can also be placed in the luggage compartment, which cannot accommodate living creatures, so it's possible the box is special."
Container props can also hold living creatures, but container props can be placed in the inventory. It always comes back to the box being the issue.
"It's not a prop, it should be an instrument." Tong Qi scratched his head. "After all, it needs to contain Mental Interference Force. However, instruments can also be placed in the inventory."
Xu Huo's brow slightly moved; not all instruments can be placed in the inventory.
