Interesting point, but not a great analogy. A reflection is a "live" copy, you can move your arm, and see your reflection move its arm. Your scent experiment is more like recognizing from photos.
Also, I think don't you understood my point. My point is that different species recognize themselves differently. Cats recognize themselves and others through smell. So a mirror test is not applicable. It would be like giving a blind man the mirror test and expecting an actionable result.