There are a lot of differences in animal husbandry from commercial operations and backyard flocks. For one commercial operations do a lot of things to counter overcrowding, like debeaking, preventative maintenance that we as small flock owners wouldnt need to do. I have read some older commercial egg and chicken information but nothing newer than the 1980's and I am sure that things have changed a lot in that time.
I have had very poor hatch rates from most of the shipped eggs that I got. Some were from here in the state, and some from across the US. They are all about the same, poor. I would guesstimate it safe to say that about 20 percent or less hatch rate for chickens for me with shipped eggs. I have had dozens not hatch and were clear when I candled or eggtopsied them. I would rather get local fertile eggs if I could. Shipping I think takes too much of a toll on them. I got lots of scrambled eggs, and you can see the yolks floating around inside when candled on some. Regardless of how they were packed, poorly or good.