I haven't read 240 pages of comments (!) but I wanted to mention that I have even tried having eggs shipped to me Registered Priority, for the "extra careful handling" and the "scan every time it moves'.
It took 4 days to travel from Texas to Washington. It was scanned at the receiving PO, at the hub in Texas, and then nothing for 3 days. Then all in a rush, Seattle, Kirkland.
9 eggs arrived in a well-marked and well-packed box, every single one with a ruptured air cell. I let them sit 24 hours before putting them in, unturned, for 9 days.
3 began developing. 2 quit within a few days in the turner. 1 is still going.
I could not be more disgusted with the post office. What is the point of an expensive 'carried by hand/not machined or conveyor belt carried' service if the eggs arrive as badly abused as if I'd gone with plain old Priority?
I'm beginning to think I may have to have hatching eggs shipped WITH live chicks, for any egg to arrive in acceptable condition. After all, chicks are treated reasonably gently as far as I know.