I have the worst luck with shipped chicken eggs. My first order from Ebay was 40 eggs and 2 hatched. Second was the NYD swap eggs, 6 and none hatched. Now I've got 18 due to hatch on 01/21 from an auction here on BYC and I'm already down to 9 that look like they have a chance of hatching. I've bought tons of button quail eggs over the net and had a great hatch rate with those. Don't know why I'm having trouble hatching shipped chicken eggs.
Some day....Some ingenious BYCer will invent the perfect "reusable egg shipping container". It will have some type of outer liquid cushioning that will also hold the inner temp at a steady level. What do you think?