(Sorry for my bad english)
Everytime Karl is working on his "soldiers" or working on dead bodies in general, he is talking about every step in detail for his voice recording to hear how he improved or to remind himself how certain things are done again. One day after a successful surgery he cleaned the blood of his hand and layed the voice recorder in the drawer to the others but noticed very quickly that the all the other voice recordings are missing. Karl was a bit scared it was one of the lords or even Miranda herself... no one dhoulf know about his soldiers but someone clearly stole them... he looked around but really nothing else was missing... how strange... Karl set up a net trap and a camera, placed the voice recorder in the drawer and went to bed