There just was a discussion on the peacock thread about some eggs shipped like that - most of the pea breeders don't like them. 
I don't ship hatching eggs,  (well, they could be, since they are fertile) - but I do ship eggs to my friend in NYC about once a month - after trying several methods what works best for me is to use the largest flat rate box, put crumpled newspaper in the bottom, then a layer of large bubble wrap, then I wrap the eggs in small bubblewrap, then top off with large bubble wrap. None broken doing it that way & I've been shipping them for a couple of years to her. 
I did get some hatching eggs in foam one time & they all came in just fine - sure was a big box to put them in though.