Great that you passed the visual with nothing missing.
You’re pretty close on that second test. If it was me, I’d add a gallon of denatured alcohol (or 2 bottles of Heet) to a half tank of gas and test again. Others here may have more virtuous advice but that has worked for me in close situations.
Any idea of how old the catalytic converter is? Probably not original as the numbers seem too good for that.
I do not know age of cat. I will take a gander under tmrw.