Quoted from GreenMarine:a local pinball transporter here in Florida. He does it for a living.
And what is his living as it relates to transporting pinballs? Remember that Ops used to have to transport them all the time, either for swapping around various locations, or service & shopping. I bet there were - and still ARE - ops that contracted "transporters" to move machines as needed. Or sent some random guys with a dolly and a truck. And I'd wager 99% of them didn't give a crap about the bottom: "That's what the feet are for and who sees that anyway?"
You can transport pins for a living by making sure they arrive in playable condition, in player-pleasing cosmetic condition, and most any operator and most players / collectors will not bat an eye at minor scuffs on the back. Hell, most ops don't care about scuffs and chips on the sides and top! And most couldn't tell you which scratch came from when and where because pristine games are a rarity.
It sounds like you expected white-glove collector-class treatment for your pristine game. Which is your right, but also your responsibility to clarify, because folks with these standards are still relatively new and few (if increasing all the time, apparently). It seem like the rest of the game made it unscathed, so your transporter apparently made an effort.... yet your "takes 5 minutes to get a piece of cardboard for the bottom which the game was meant to stand on" is the type of hassle someone who's done op transport for a living or side gig probably never ever considered the need to futz with, ever. But perhaps they would have gladly if you asked. As others have said - it's not really the norm even if it is understandable.