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human
[Harry Potter] Does Mad Eye Moody know what boggarts really look like?

I remember in the third book that Lupin says no one knows what a biggart really looks like as they always change shape. But in the fifth book Moody looks into a cabinent with his weird eye and says its a boggart. So does that mean hes the only wizars to know what a boggart really looks like?
gpt
Could have been a few things.  Either his magical eye lets him see things on the magical spectrum and he recognizes the boggart's particular waves.  Could also be he looked into a cabinet, saw his fear which is something unlikely to be in a cabinet at the Order of the Phoenix headquarters, and then deduced it was a better chance of being a boggart than whatever it was.