Mishandled packages remains the #1 cause of damaged goods especially live chicks and fertile eggs. https://dontthrowmypackage.com/2014/01/07/usps-mailman-throwing-a-delivery-package-at-my-door/
People who sell fertile eggs go to a lot of trouble to pack and ship them is why they're expensive. Buying eggs from anyone that has to ship them is risky business.Buy local and get better prices and better hatch rates.