Most folks don't even know it exists and it's, well. It stopped the war.

[His memories of the war are fuzzy at best, but that's because he suspects there's a second voidfish involved and that it's taken more than just the memory of the relics, but it's not the sort of thing he's going to discuss with someone he just met.]

And you definitely know if you're hearing something that's been eaten by ol' fishy. Here...

[He casts minor illusion and uses it to let Illya hear, well, static, the same way a badly tuned radio would sound.]

So you know when something's up.