You clearly state:
The cards were priced individually. Buyer picked 20 cards that he wanted, negotiated a discount for the group, paid the money, got the cards.
That is the operative phrase to me. Once they were returned you start new negotiations on the 15 cards he found acceptable based on the original offer price.
Life is complicated, not every solution needs to be.
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'Integrity is what you do when no one is looking'
"The man who can keep a secret may be wise, but he is not half as wise as the man with no secrets to keep”
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