I have purchased and used wicker cornucopia like these. The feet were always woven into the cone. Your photos show this, if you look to the center of a foot you will see an X in wicker, which you can follow to where it goes to the outside of the foot and is brought back through the cone to secure it. If you didn't inspect the feet before shipping to see how they were connected, you have to believe the buyer, that some were repaired with hot-glue. Without you knowing what this "damage" is, it is hard to provide advice. (other than to carefully insect things like seams, edges, attachments, etc. in the future) If one cone has one or more feet hot glued on, you might offer a partial refund for that piece. looking at the photos, photo 1 top left I can see an interior attachment X w/out glue? and the same on the last photo left.
As far as insurance goes,
1. The USPS pays for damage that they are responsible for (like a truck running over a package) if the package doesn't have tire marks on it, it would be hard to convince the USPO it's their fault.
2. They don't pay for damage that may be due to improper packaging or "during shipment" damage. (I could ship a "$50" glass vase to my mother in a cereal box and claim insurance when it arrived broken, in fact I could ship her 100 and have enough insurance money for the down payment on a house)
3. The buyer doesn't have to provide photos (it's not the buyers fault), but if the package itself was damaged, the buyer might help you.
