Lost a box with loot inside last night

Hi. I hit the wrong box last night while I was moving boxes around. It had all my monster stuff in it. None of the boxes with stuff in them have ever popped before but that one did. All my monster stuff is gone. what do I do? can I get it back?

 

After something bad like that happening, you should quit rather than saving. If you saved, but are still on the next day, you may be able to get it back by following the procedure for undoing your last save here.

 

Thank you.