I've become a "super high maintenance buyer" who asks sellers how they are going to be packaging whenever I think there's a chance this will happen. I offer to pay for extra costs if needed for it to arrive safely, and tell them not to worry about the shipping time - "better safe than fast". It annoys a few of them ("of course I will ship it well") but does seem to help avoid catastrophes. Some people are clueless tools, but some just don't have the knowledge or experience.
Some times that doesn't work either, sigh. A few years ago I decided to fill out my stoneware (plates and bowls) assortment. The pattern I use/like is long since discontinued. But I got lucky and found a large lot on Ebay at a fabulous price. However, the shipping price was way too low. I messaged the seller beforehand and told her I thought the shipping price was too low, and **offered to pay more money for shipping**, but she told me, no, it was okay, etc, etc.
Then, after she packed it up and took it to shipping, she did ask me to split an increase in cost, because, then she discovered it really was going to cost about $50 more to ship than the Ebay system had guessed. Which I happily did.
But when it arrived, about half of it was broken.
The packing was better than nothing, but there were things like torn up ice cream bar boxes used for packing material, and stacks of plates with nothing between them, taped together. One might imagine that taping a stack of plates securely together will keep it from breaking, but one would be wrong....
Anyway, she was really nice and had some additional pieces she could send (properly, individually wrapped in bubble wrap this time) and it all worked out okay in the end. But what a waste.
So the point of the story is, even when you tell them, and they're nice people who want to send you good stuff, sometimes they just don't listen/believe you.