I've heard the same thing about using the black paper on the side of the enclosure and holding off on handling them for at least a week after introducing them to their new enclosure. What's interesting is my breeder mentioned trying to feed them within a day of receiving them to prevent all the time that goes by where they are considering they are in a new environment. Basically it helps reduce their stress levels. Thought that was interesting because it was different then everything that Ive been reading on here.