Broken CD?

So, I sold a CD and sent it to the guy. I got an e-mail saying it broke, so it must have broke during shipping. So, I issued him a refund and that was that. Then, I get this e-mail:

Thanks for the refund. I don't think you sent a broke cd on purpose, so I will not leave any negative comments. The cd was sent fast, things happen.

Wow. Really? If I had done it on purpose, would I have issued the refund? Wouldn't I have just ignored you? Nice sleuthing Sherlock...