I personally would ask him. You could do it casually like "hey, I was messing around looking at the registry and you didn't show up. Did you forget to re-register?" (And knowing me, I would probably turn it into a joke of some sort because I do thrash with everything). It probably costs money to register with them, so if he's not seeing enough gains from it, he may have let it lapse, or forgot to get it done again.