I know people are not going to like my response to your matter, but if it states in the listing " will not take responsibility for items damaged in post without insurance" even if the insurance from AP doesn't cover it then sorry your out of luck (maybe they mean self insurance). I do feel for you though, no one wants to receive something smashed up.

Maybe the seller should have packaged it better, that is what feedback is for. You are esentially holding the seller responsible for something out of their control.

I also wouldn;t put a fragile sticker on anything.

You agreed to the terms of sale when the purchase was made.