Don't blame the system, blame the people.
@yogiboy Being that you stated "I know that many ruin these speakers trying to pry the magnetic grills off incorrectly", did you give him a heads up about this before he received them? Whenever I sell and ship something that may require special attention, I will send them a message about how to unpack, etc.
If the shippers were not taped properly as the buyer alleges, don’t you think Fedex would have picked that up? Why would Fedex allow improper packaging through there system? The story doesn’t make sense. You sound like a very conscientious person, but the buyer doesn’t seem to match you in that regard.