I swapped eggs with two people on the board who very carefully wrapped their eggs. The second box looked as though it had been kicked around by the post office as it was torn and in the middle of the driveway...no where near the mailbox or stoop. I put the eggs under two broody hens and after the hatch date, I start to find broken eggs shells. I check the eggs and to my surprise find that they feel all liquidy inside. I opened them and was horrified to find that they all smelled like rotten eggs and some were turning black and actually EXPLODED as I tapped them on the ground. Not one of them showed any signs of development. I'm completely baffled. How could this have happened?