I am sad to see all these horror stories. All those lost airguns and pellets and scopes...
I have had several items lost or shuffled around the country also. I had a set of grips sit in my local post office and the DEi hire kept telling me it was not there. Even though she never got off of her chair to go look... I opened several cases with the USPS Inspector General over the issue once I realized it ticked her off. EVENTUALLY I asked the correct person and he walked back into the sort facility and found it in like ten minutes...
I recently purchased pellets from New England Airgun and had no other option but USPS. When I realized it was USPS shipping only I really had to think the purchase over. Almost cancelled the order over it. Amazingly they showed up. Must have been an anomaly.