Congrats on the chick! and thank you.
Oh no I'm so sorry. That must have been awful to find. Do you have a bator to put the remaining eggs into? Or another broody to take them? If you don't you can warm them in a yogurt maker or any variety of homemade ways.
Probably a raccoon?
I'm assuming it was a raccoon or a possum. The eggs were only under her for about 24 hours so I'm just going to put them in another nesting box and hope another hen goes broody. Think that would be okay? Since they probably didn't have time to really take anyways.