Alright, here's what we do. Take some eggs, go to day 3. Pull them out. What's average shipping? 3 days? Set them aside at room temp for 3 days. Put them back. See what happens. This effectively removes the post office variable.
I see it as entirely possible, I wouldn't have thought it before. But here I am on day 21 of incubation, but candling shows movement AND like a day 14-16 development. Somehow I must have had temperature issues that are making me late bloomers. If that can happen, maybe this can too?
I'd offer, but the eggs I have coming my way now I spent too much on for experimenting.