how are they doing now? mine also started to dent, they were laid on 2nd july. dented in on 4th when i checked, covered them with damp moss and by 12th july they filled out again. hope they are fine, let us know.
dimpling is usually down to slight dehydration, or they are about to hatch. increase the humidity with damp moss or a light spray with room temp water.
I lost some got 12 left some of the dead ones started to get green mould on them I carefully cut them away from the good eggs, can't do anything about the dead eggs underneath the pile as i can't get to them without damaging the good eggs.