Buyer is claiming damage that was done by him!

Hi group,
I sold a pair of mint Harbeths. I shipped them in original double boxed carton with original bonnets covering them. I just received this EMAIL from the buyer. I know that many ruin these speakers trying to pry  the magnetic grills off incorrectly. What is my recourse with this issue?
Thanks  much for your input!

This is the EMAIL I received from the buyer!

Hi. I picked up the speakers from FedEx yesterday. They arrived with some minor dents around the front top corners near the grille on both speakers. When I opened the outer box, I've noticed that one side of the inner box wasn't sealed on top and as a result the speakers came out of the top foam speaker holder. I guess the damage occurred from speakers bumping against each other. The grill cloth is also ripped near the dents. I've sent an email to Harbeth asking how much replacement grills are going to cost. I could probably live with those dents but grills might be replaced at some point. I'm still waiting on my amp to come back from service, so I have not even plugged the speakers in yet. Hopefully the drivers are ok.    
Don't blame the system, blame the people.
How long will it take you to fix it already??
Yogiboy. You really went above and beyond dealing with this buyer and I congratulate you. 
Sidog. If you brought an open or damaged box to FedEx and wanted to insure the product, I doubt they’d accommodate you. 
@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.