So late last night around 3-4 AM I couldn't fit everything in my inventory and left some things in a chest and didn't lock it which seems very stupid. As I haven't had any chests looted in the past, I put the chance of an event like this happening below 2%. Since three chests were involved, and since the cost without refund of locking the chests is 1500r, this makes the valuables having to be worth 75,000r to justify the additional expense under standard risk analysis. Valuables included several enchanted diamond pickaxes and ores with a market value around 40k. Many precautions were taken. The room was completely unexposed to outside, deep underground, and the culprit tunneled in from underneath, straight through the rock. Somehow they figured out that the room was there, I suspect a see-through texture pack.I know tracking exists for use of lava buckets and flint and steel, though I don't know about chests. Are staff able to see who accessed a chest and when?