Is someone on your SMP stealing?
With this mod, you no longer have to worry about leaving your items in a chest as if you notice something missing you can just open up this txt document check the coordinates and bang you've got them.
We made this mod so it worked flawlessly on Vanilla SMPs and didn't make any difference in-game.
Showcase and installation guide: https://youtu.be/M8GtqcOvnuc
How it works:
Every time a player opens a chest, or an entity that can store items, this action is logged into a txt in the world folder in this format:
[date time] playername dimension coordinates (block/entity name)

This mod logs the:
chest, trapped chest, hopper, shulker (every color), ender chest, barrel, donkey, mule, llama, chest minecart, and hopper minecart.

This mod requires the fabric API