I bought 60lbs of lead from a fellow caster here and I received all of the lead he sent but it was repackaged and I also received a letter from the post office saying the package was damaged (they did not know if anything was missing). I have orders other items via USPS and the boxed arrive damaged and contents spilled in the box. I don't believe any of the have been improperly boxed for shipping but I have seen these guys drop boxes out of the back of the mail trucks and hear them yelling and throwing boxes around at the main post office terminal in big D.
As a kid my dad was a member of the Knigths of Columbus and a fellow member was our mailman he lamented before retiring the system was moving to contract some jobs out to guys who did not care much about doing the right thing. No offense to current mailmen but speaking from my own experience.