Floating the eggs will not harm the chick unless if there is a pip or crack. If there is an opening in the shell, do not float. I would not get my hopes up on those.
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There is a very high chance that they quit and are no longer alive, but its not impossible that they are late. WE cannot tell you if they are alive. You have to check for yourself. Have you candled or float tested them? If there any movement or cheeping?
And we have another one pipped this morning!!
But we had to bury 2 other eggs