Have you ever tried to collect on a USPS insured parcel that was damaged? Darn near impossible to do. I tried to collect on a collectible 1qt fruit jar I had shipped. I used a 5 ply cardboard box. It was large enough so that there was 4 inches of space on all sides of the jar. I filled this space with foam rubber. It got crushed. USPS said it wasn't packed good enough!