Yes, the same thing happened to me two weeks ago. I was expecting 25 chicks, and nothing, then on tuesday I got a call from a post office 200 miles north of me that the chicks arrived and were "very dead".
But I called the hatchery and they were very nice and we decided to wait two weeks until the weather (there) "warmed up" to over 40 degrees, and try again, this time insured so they would not be mis routed.
Yesterday I got a call from the post office here that they had arrived but just one or two were cheeping weakly.
By the time I got there, about 30 minutes later, I could hear healthy cheeping when I walked in the door. They had warmed up and were alive and vigorous, every last one of them! The normally gruff postal worker was cooing over them and petting them while I was signing the receipt!
It is sad when they do not make it, but I guess it is a chance we take with their fragile little lives and the system.
julie