I'm going to jump into this conversation, if I may. From my lurking around, what I'm reading, is that Silkies are notorious for hatching and overall health problems. Bantams tend to hatch before LF, and smaller eggs tend to hatch before larger eggs. Did the last 2 Silkies not even pip? One could argue that if they pipped early, before lock down, it might have been too dry for them, (causing the shrink wrapping) but that does not appear to be the case. And we know that Amy keeps her humidity high at lock down, so I'm led to believe that these particular chicks are prone to hatching problems.