The question was asked about hatch rates and shipped eggs. I have shipped dozens of eggs all across the US. Packing is extremely important. The USPS is extremly ruff when it comes to eggs. I used to put all kinds of labels on the shipping boxes, fragile, Live embryo, and anything I could think of to insure the boxes where handled with care. Nothing seemed to work, boxes would be delivered looking like they had been drop kicked from the 40yrd line. I was shipping some eggs one day and had all my warning lables on the box, I paid for the postage and the lady behind the desk turned and just tossed my package across the room, into the big basket. I stood there and just looked at her for a few seconds and then asked her if she even looked at the labels before she threw a box full of eggs across the room. I finally stopped putting any kind of label other than the address on the boxes and all of a sudden, my packages started arriving un-damaged. I honestly believe the USPS workers delight in knowing that they broke something that will make a mess in the shipping bags.
With that said, I used to wrap each egg individually in the small bubble wrap and then wrap again, in pairs with more bubble wrap. then line the walls of the box with bigger bubble wrap and fill in any voids with dry sawdust. This seemed to keep the eggs from breaking. Hatch rates usually ran about 60-70 percent on shipped eggs. Even with all the extra care in packing, you will loose a few eggs because of the bumping and handeling during shipping. I once drove 200 miles to pick up hatching eggs just so they wouldnt be shipped. Worse hatch rate I ever had, I think I got 6 or 7 chicks out of 2 dozen eggs. Guy I bought the eggs off of made good on the unhatched ones and gave me 2 more dozen, but I had to drive the 200 miles again to get them. I think I eneded up with about 75% of those hatching. Its a gamble shipping eggs, even if you are the one doing the handeling between supplier and your incubator.