Jimnjay, great answer. I read that article about the warm sand. The eggs need heat and humidity, that late in the hatch they do not need to be turned.
They may need more or less time due to loosing mom. I know if your incubator has a temp spike, more time is needed. I know nothing about if it cools.
I have carried around cold dying chicks in my clothing as well, but a good old blowdryer works better than my body temp for cold chicks.
Sorry about your loss, boy would that break my heart. I have had birds snatched away with the feathers everywhere, nothing else. Good old Cement fixed that for now.
Keep the thread updated with the hatch time, etc. Hope the little ones make it.
You can candle the eggs to see how developed they are. We are all here to help, just let us know what you see. Good luck to you.