alright, i asked some outside friends about this and as to why it suddenly stopped here and i guess i was being a bit vague. i apologize for missing details and ill make sure to account for them when i update.
as for now, ill have to railroad an action for the sake of not reaching a dead end.

You try the key on the one other lock in the room. It manages to fit and the chest opens up.

No wonder it felt so light. The crate was relatively empty, save for a weird wrench and a small note. You take the WRENCH and the NOTE.

This is your INVENTORY. Whatever can fit in here goes. This includes what is being carried and what you can pocket.
It currently includes:
WRENCH
ROPE
KEY
SMALL TOOL
FOLDED PAPER and NOTE
GUN MAGAZINE
The wrench will absolutely come in handy. Hopefully.
is the inside of the weapon case foam or what? try to pull it out
It is foam, and seems to be attached to the crate.