@clock when a ferret about to steal something they make more less no sound so like the world best robbers. If you hear them speaking in there usual chatty voice then for now no robbing planned but when they stop speaking or making sounds it means they are doing something big or funny such as I saw one of mine before trying not to sure for why when I was shop manager before one of my ferrets tried to steal a giant amount of Electic cigarettes still no idea why a ferret needs to smoke or needs them unless they got I don't know black market selling operation going on I don't know about where all ferrets leave their homes to meet up with other ferrets to stay trade.
I am trying to find the video of the ferret who robs a chip shop somewhere in England everyday of the week