I wouldn't refund, not after two months, and not for that price - however, sometimes just for goodwill I have given a refund, it's not worth arguing about. However - I don't refund return postage. This one I think I would argue about, since he's had two months already to check it.
There is now an option on listings for you to state whether or not you give refunds - might be worth looking at for next time.