Sorry to read that shipping horror story, too, Mike.
Ive had it happen, too, even when I have sent a note, after winning something, about shipping a rolled poster in a sturdy tube with end protection, or a folded poster between non-corrugated cardboard (because it will always likely get bent), during shipping. And if ignored, and someting arrives dinged, I've asked for refunds or partial refunds, depending on the amount of damage. Some things have been reimbursed totally without question, as I will have taken a photo minutes after un-packaging the poster and emailed it to the seller (along with their ebay pic, as a comparison).
And while getting a refund is nice, it's the Poster we all are wanting.
What I have found too, is that some sellers get So "pissy" when you ask then to put some tissue in the ends of a tube--- like doing that is the
biggest chore in the world.
So i write uber nice, package-instruction notes, to keep them calm...LOL. It seems to work a lot of the time.