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.    
Just a question for edkc1 since you have Fedex experience, if the boxes were damaged to the point of being opened would fedex document this, especially since it’s an insured item.
I would contact Fedex. The carrier contract was with you.
If the speakers were signed for on pick-up, was this damage noted with Fedex? Surely he would have investigated then. 
Get advice from Harbeth?

I also would not be offering him anything.

What about the pictures you took to sell the speakers in the first place?  Did you take pictures that clearly show the front of the speakers with no damage?
Yes I did. All the pictures were shown in my listing!
The last dozen sales, I take pics of how the items are packed, serial #’s, outside pics of the boxes, and a short video of the piece playing. I always send with insurance and adult signature required. I always send the pics and short videos to the buyer and he has to agree he is ok with everything. These procedures have saved me numerous times: buyer said he never received the item but I checked and the shipper had his signature, somebody tried to state the vintage piece didn’t work and he was going to do a swap with his non-working piece so when I told him I will only take it back if the serial #’s matched, he decided to keep it, and a few other instances. These all used PayPal. I’m selling a 150lb turntable now and will only sell it locally after the person hears it and pays cash. Sold a pair of 140lb Ushers that were in perfect shape with boxes and I refused to ship. The guy drove 1000 miles round trip to pick them up. Doing it this way both parties know what they are getting with no surprises.