To answer your question that is now irrelevant if the chicks have died in the shell (

!), I've literally had dozens of broodies hatch 100s of chicks, and I've never seen a broody help a chick out of a shell. Not saying it's not possible, but I think highly unlikely.
In your pictures posted earlier this morn, the 2nd pic (I couldn't see the egg number) does look like the chick may have died in the shell.
As far as not seeing movement, I wouldn't worry about that too much yet. Chicks will rest after internally pipping into the egg sac before they make their final effort to escape the egg.