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.    
This is why I hate using paypal.  Audiogon makes every transaction run through paypal now.  Even if it is for a local pickup.  Paypal doesnt protect sellers at all.  As a buyer, you can go around demoing peoples gear for cost of shipping if you wanted to take advantage of paypals buyer protection.  Ive had this exact same thing happen to me a number of times.  You kinda have to just do what the buyer wants, or else you get the item back, and lose out on shipping.  And who knows what the buyer did to your gear.  I had a 70lb center channel a guy wanted real bad.  I told him I would not ship it.  He begged and begged, and I finally gave in and packed it up and shipped it.  I triple boxed it.  Buyer emailed me and said the speaker was damaged, but the box was perfect.  He filed a claim with paypal, and I was out the money, and was returned a center speaker that looked like it was dropped off the roof of a house and with blown drivers.  I ended up just throwing it away, and was out $1,000.
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.