
So when I check them the next night (day 11) both parents were in the box. On closer inspection the hen was on the chicks with the cock in the entrance on guard duty. I guess they didn't appreciate someone steeling their box for the night. They did the same for day 12 and for day 13 the hen was still on the chicks but the cock had left his post.
I am pleased that they have gotten through those few critical days and the chicks are now better feathered (I assume).