Unless the guy was a regular customer and you were looking to keep him that way (doesn't sound like the case), I'd just block him and move on. Anybody so unreasonable as to think that you SHOULD give him a refund a year later is a kook you don't want to be dealing with in the first place. If he sheepishly mentioned the situation and asked if there is anything you could do and apologizing because it's been so long and left it up to you, then maybe. Even then I'd make him produce a receipt so that you could at least know how much he paid. If he can remember a year later where to look up the guy he bought it from, he ought to at least be able to produce some record of the transaction.
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