Dan, IMO, the bottom line is that once Will finds that there is an obvious issue with a knife you sold him, HE should be the one to decide what course of action to take. He does not have this luxury if it's just buyer's remorse, but that was not the case here. Asking for pics etc. from him is just setting the stage for an argument. As soon he contacted you with the issue, your immediate response should have been, "What would you like me to do to make this right?" That is the only way he can be satisfied. He is not looking to pay less for the knife nor is he looking to inconvenience you. He just wants a good Busse Basic 11, and that is exactly what he paid for. He paid you, and therefore it is your responsibility to make sure that he gets what he paid for. It's really just that simple.
From the time he sent the email letting me know something was wrong to the time he shipped out the knife to Busse was 3 hours 12 mins. That's not even counting the time he took to call and talk to the company. He had my phone number which he chose not to use and up to that point, the last words he said to me was that he was going to contact Busse and keep me updated, so I was waiting to hear from him....