How do you know its an AX???

[Foschi Exotic Serpents]

There are 2 different ads on KS for super lessers with red pupils.
One is for a super lesser axanthic and it says you can tell what it is from the red pupils.
The other is for a super lesser pied and it says you can tell what it is from the red pupils.
I wouldn't know what to believe.

I also saw a super mojave for sale once with one blue eye and one red one. They were saying it was just an odd super mojave and not a combo.

For me I wouldnt purchase one unless it had been bred and proven. If like you say, a red pupil can happen with just a straight super mojave then how could you be positive its an ax trait without breeding?