Mundane Stunts.

From playtest stuff we know there's a Linguist stunt for knowing a bunch of extra languages beyond those from Scholarship, and +2 to a skill under specific circumstances is one of the general things Stunts do explicitly. It's pretty much that simple, though appropriate Aspects could help, too.

Yeah, missing persons is the standard Dresden Universe explananation, I think it's gone into explicitly in Dead Beat (reference is made to the number of missing persons who are never found being the same proportion of the population that herd animals lose from predators).

Monster kills actually don't tend to wind up listed as murders, for a variety of reasons, from the fact that the bodies are usually either clearly killed by a wild animal, or completely gone in one way or another (either eaten or disposed of somehow) to, in the case of more subtle predators such as the White Court, the fact that they show up as heart failure or something relatively innocuous like that.

I would say opening a rift to the nevernever and flat out vanishing before someone's eyes is pretty near it. Calling up winds to come in from different directions, or making a tiny whirlwind. If I saw someone do that I'd be sold.

Actually, I'm pretty sure that, with modern techniques, good stage magicians in real life can duplicate the visual effects of both of those. If I saw them on a random street corner, I might be convinced (a good stage magician wouldn't waste the prep-work necessary for those kinds of things like that), but a fair number of people really wouldn't be.

Still, it's a goal, maybe not an achievable one, but progress could be made towards it.