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How were they packed?
If you're getting broken eggs, odds are good that there's a problem with the packing. People often think they're doing a good job packing, take great care at it, but don't realize that if the eggs can move at all, inside the package, they may break, scramble, or have broken or damaged air cells.
Parcels are machine sorted, and those machines can't read, it doesn't matter what's on the box. A well-marked box (I put "Live Embryos" and cute photos on mine) can get better handling during the brief time it's actually handled by people, so that's still worth doing, but at some point it's going on conveyor belts, where it will get dropped about three feet, from one belt to another, and at the end land in a drum, with other boxes falling on top of it. I did get some very well packed eggs from Seriousbill, (Delawares) and got 7 healthy chicks, (they're abut 10 or 11 weeks old now, and gorgeous!) would have had more, but I really did have 'bator issues that time, some temp spikes, and humidity problems.
It also helps to reduce shipping distance, if you can find a source closer to home. Eggs from Ohio to KY, will likely fare better than eggs from WA to KY, for example. I had some from Louisiana that got tossed around very badly. First packing job not as good as it could have been, but the seller really though he had done a good job. He sent replacements for part of the shipment, at no charge, not even shipping, and wrapped them much better the 2nd time. They still had damaged air cells, but none broke, and the air cells weren't ruptured, like before. I still got a zero hatch, though.