Unfortunately, Ryoji has a much harder time telling in this case. For a start, there's nothing clearly wrong with his lifespan, which is usually his biggest hint. And secondly... Ryoji knows pretty much nothing about Changlings. They're not a thing he crosses paths with as much. (They don't mess with the dead most of the time, so he has no reason to.)
But there's something going on here, and he's not sure what it is. "I'm sure someone would be able to do something with it. There are people who are really good at that kind of thing!" Not him. Not him at all, but. "Yeah, Halloween can get pretty crazy around here. Were you out at all last night?" He doesn't look old enough to be out, but that doesn't mean he wasn't.
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But there's something going on here, and he's not sure what it is. "I'm sure someone would be able to do something with it. There are people who are really good at that kind of thing!" Not him. Not him at all, but. "Yeah, Halloween can get pretty crazy around here. Were you out at all last night?" He doesn't look old enough to be out, but that doesn't mean he wasn't.