This is dangerous situation, when guards or bandits don't believe to explanations - even if char drop all items and resouces - often they must kill char to check innocence
At Polish Forums was proposed that we have in Inventory button or link "Show All" - after use of this button by suspicious char (he can but not must do that) message with list of invisible items will be displayed:
9999-9 Maybe thief carry: 100 g of diamonds, 200 g of gold, 234 g of fresh dung
This can be also useful in trade.
