I dont thinks it's people personally doing so much as it is all the vibrations of travel, and jarring around and potential drops off conveyors, extremes of temperature, and x-ray equipment that ends up getting them. And also, you have to consider how well your seller packaged them to start with too. It's not all the USPS here, some so called sellers have no clue on how to box an egg.
I had some come bubble wraped, tossed loosly in a berlap sack and put in a box, no extra packing or any thing, another set was, wraped, in and egg cartoon, and tossed in a box, no filler or anything! Of course, these all arrived with yellow ooze coming from all 4 bottom corners of the box.
But it is the vibrations of the travle and trip that rupture the air cells.
Think of how many bumps you hit going down the road!
Aubrey