I found a nest of 16 eggs. I don't know how long they've been there. Some were cracked due to freezing but many looked just fine. Of the eggs that looked fine, some went "thunk" when I shook them which I assume is a frozen yolk rattling about. I set these aside for use in dog food. Some eggs were uncracked and felt solid when I shook them. Those I set aside for eating. The outside temperature hasn't been above 50 for many days and the nights have been at freezing or a few degrees above. Is there any possibility that the solid-feeling eggs are good for eating? Is there anyway to tell if the egg is still good? Nobody sits on these so I know none have developed (yes, I do have a rooster). Also, I replaced the eggs in the nest with golf balls. I hope the chickens keep laying in their golf-ball nests.