Shipping through the USPS

I have shipped a lot of stuff thru the mail and it is by far the most reliable method. But they have some strange policies. If you insure a item and they lose it, they refund the item and the shipping. If on the other hand a item gets destroyed by them they will only refund the item and not the shipping? I know I've had both happen to me. Another thing, they like to deny a claim right off, appeal the decision and stand your ground, they will refund you. Shipped a grill to a member here that was destroyed. Eventually I got a refund.