The biggest thing I see, out here we have long, dirt/pea gravel drives, and they tend to be bumpy. The drivers fly down the drives, bouncing hard, even times when the tires are not touching the ground. Our driveway actually has asphalt, but we didn't get the big roller to flatten it totally smooth, like a parking lot. I personally threatened one of my mail ladies with a lawsuit if I caught her doing over 50 down my driveway ever again.
I realize they have a lot of mail to deliver, and unlike the city, where all the the houses are right next to the roads, and smooth, out here there is a lot more territory to cover to deliver half as much, but they don't have to do it at those speeds down these country drives. Anyway, that is how the eggs get so scrambled. The packaging can handle the drop. It's the constant bouncing in the back of the delivery truck that does the most damage. I have said that if I ever order eggs again, I'm going to have my eggs delivered at a friend's house in the city, and go get them.