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I worked for a long time as a 'preloader' at UPS- my mom did for 17 years. A preloader takes sorted packages off of a belt and loads a semi-trailer with them, an effort to leave NO AIR SPACE is the goal. You take special classes where you're taught to play a real life game of Tetris to make sure no big gaps get left, and to make sure that stacks aren't unsupported.
Many times a package gets turned sideways despite arrows, or gets dropped off the belt accidentally. Oftentimes the belts get turned on before the loader is ready and packages pile up in a way you can't possible imagine until you've seen a plant with HUNDREDS of miles of conveyor within. Some folks try really, really hard to protect stuff, and at UPS you are fashioned with all kinds of strap on laser-scanning and cameras are on you, etc. Very robocop. It's still a gamble. Fedex does a lot of the conveying for USPS. Their system is a little rougher from what I hear. It is what it is!
The thing I'd like to tell everyone is that it's crucial you put your eggs fat side up, and tape them all together in a brick if you don't use cartons. If they can shift against one another you're doing damage during the shipment. They need to be a whole unit to arrive less shaken. Fat side up keeps them from detaching aircells.