Fun to read about your experience, but it does no good to "anticipate" a certain hatch rate -- they'll hatch the way they want to, and sometimes you'll be pleasantly surprised and sometimes the opposite.
But for anyone who worries about shipping hatching eggs, I have a story from years ago. I had some New Hampshire Bantam eggs shipped from Wisconsin to Texas. I had them in an old-fashioned "hand-turn" incubator, and at the time, people had told me that leaving the eggs out to cool for a few minutes each day would help the hatch.
So, of course, one night I forgot the eggs and left them out overnight, in a room with little heat and outside temperatures in the low 40s. The eggs felt like ice the next morning.
And I still got a few New Hampshire Bantams! If the eggs come from a well-managed flock, they can go through a lot and still produce. I understand that a lot of it depends on the stage of incubation when you decide to abuse them, and I was just lucky.