Due to the nature of their idea of death, bodies are more or less decently preserved. In addition, the biomedical field is a poppin business my dudes. There are legal routes to getting an amputated arm replaced with another person's real arm, but the waitlist is long, and you have to figure out who your perfect match is in order for the surgery to work. The waitlist is also very long because again, most people want to preserve their body for when they can be reanimated, so uhhh yeah.

So there is a market for people who steal other people's body parts and use it to do their medical stuff. There are criminals who specialize in body snatching, and you gotta be careful of them. Not of all them work solely on dead people.