Mafia 54. This is where caravans are robbed!

So, the description of the lich suggests it's similar to a non-disclosure agreement for smuggling, but it belonged to Sab. Yesterday, another caravan or a maniac visited him, using a non-disclosure agreement on him. After that, he stole Sab's non-disclosure agreement and used it today, meaning the maniac didn't kill anyone for two days but instead used non-disclosure agreements on caravans. Because one caravan couldn't rob another caravan, and the maniac simply repeatedly used another non-disclosure agreement on a caravan.