To my understanding, it's because of all the rattling around during shipment can damage tissues anchoring the air sack.On the extreme end, the air sack can become disconnected and move freely within the shell. Not turning them for a few days gives the eggs a chance to repair that damage - hence improving hatch rates for shipped eggs and why the recommendation is different for collected eggs.Yeah. That “don’t turn shipped eggs for awhile” coinciding with the time when studies have shown eggs really need to be turned, seems so odd to me...