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Troubling issue--I need advice

I just sold a package of 5 U.S. Silver Proof sets on ebay, in the original U.S. Mint mailer. When I received them myself, I couldn't help but open to confirm the contents. All of the boxes were unopened, save for one I used to take photographs for the auction display.
The buyer informs me that he received the coins, opened all the boxes, and says several of the coins in one set have acquired light toning. He objects to this and has asked if I have a replacement. I do not. Should I offer a refund on the one set, partial compensation for the toning on that set, or say "nuts? to the objection altogether?
These are the 1999 Silver Proof series, so needless to say, he paid a pretty penny.
The buyer informs me that he received the coins, opened all the boxes, and says several of the coins in one set have acquired light toning. He objects to this and has asked if I have a replacement. I do not. Should I offer a refund on the one set, partial compensation for the toning on that set, or say "nuts? to the objection altogether?
These are the 1999 Silver Proof series, so needless to say, he paid a pretty penny.

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Russ, NCNE
Didn't wanna get me no trade
Never want to be like papa
Working for the boss every night and day
--"Happy", by the Rolling Stones (1972)
You should have checked them before selling.
Work with him.
However, it sounds like your customer didn't understand this when he bought those sets, and was merely expecting something that looked approximately like what we he would have gotten from the Mint had he ordered them himself in 1999. If it were me, I might err on the side of good customer service, ask what the purchaser wanted to do, and go from there - not because I had to, but because I wanted to.
>>>My Collection
K S
Geez, some people are never happy!
The name is LEE!
Not necessarily true. Its pretty easy to tell if the average person has opened the little flat box and removed the plastic case containing the coins from it. The end flap that he opened will shows signs of being messed with. I can tell which of mine have been opened.
NoEbayAuctionsForNow
Guy
On the other hand, if you feel he is being reasonable, offer a partial refund that both of you can live with.