One of the reasons I am not claiming eggs is the abysmal egg to hatched chick ratio from shipped eggs. I have had many swaps that have not produced a single chick. My eggs do well so I have to think that something happens while they are in transit. I believe it was the Arkansas group that had an incubating seminar with Dr. Bramwell and I remember reading that temperature fluctuations are very stressful to eggs. This spring, at least for us, has been crazy with up and down temps. Since the downsizing of the USPS, I think packages are sitting on docks or trucks waiting for processing and are subjected to wider temperature swings. Also, longer periods of time are being taken to get from point A to point B so more chances for those swings to happen. And, the automated processing doesn't handle eggs the way they need to be handled.