Did you actually issue a refund? When was this? Nowadays, Amazon only allows refunds for 30 days after a sale.
Right now, I'm getting a string of people who are saying things like "The package was intact, but the item arrived in 2 pieces" when I know darned well that I didn't send it that way, so I just tell them, "Return it and I'll refund your money." I also got a memorable series of e-mails from a man who was definitely not a native English speaker who wanted to know why the book was covered in crayon marks, which I also knew hadn't left my house in that condition. I kept telling him to return it if he wanted his money back, and he never did.
Most of the textbook-on-Amazon stories I see on the vendors' message board are things like the vendor who had once purchased a $200 textbook and it arrived in a brown paper grocery bag that had been sealed shut with electrical tape - but it did arrive and was in the condition described on the website.