So if I'm not mistaken, we've elminated every single thing in the room except the box itself. I'm just not seeing a solution to a puzzle with nothing left to puzzle over. At this point our best bet is to idle for 5 years until the box rusts itself open.
Mr. Stick is so tired, being stuck here, so his imagination goes wild...

...
NO!!!
Mr. Stick is sure there's quick solution to this puzzle! He's sure he already discovered and examined everything in these rooms, he should only find one single helpful thing, one simple method...
He eliminated everything from picture inside his mind. Seems he missed something... Something he forgot...
<Sigh, I thought someone would find a solution, especially when you removed the most of unnecessary items and objects for this puzzle. But you still missing something.
Hmm, let's say... Check my previous posts where you eliminated items from rooms no longer than five such posts ago. (Starting from
https://www.gangoffive.net/index.php?topic=15974.msg531523#msg531523). Answer is somewhere there... If you still can't find it - I think you should, again, reread previous posts in this game where these remaining objects were found/used somehow. After this, I'm sure you will be able to find the solution.
Good luck.>