I buy a lot of shipped eggs every year. From all over the country. And I've had hatch rates from 80% to 0%. I've found its mostly due to how they are handled mostly. And partly how old the eggs are. Shipped eggs are always a gamble. I've spent a lot of money on eggs that never hatched. And bought egg pretty cheep that hatched great. But that's just the way it goes.
From what I've read, it seems like the freshness of the eggs has a very big impact on hatch rate. Of course handling being the biggest.