So you could 'drop pipe bomb'
Then omote pipe is tucked under a pile of trash, barely visible at all.
Anyone entering the room would then see, 'A pipe bomb lies here, tucked under a pile of trash, barely visible at all."
It was a temporary room description that would get wiped if the item was picked up and dropped again.
I kind of thought it was a silly addition when they added it, but it ended up being really fun and I think it could be even more fun here since lots of items are left for others to find in various ways already. Adds a bit of flavor.