Although I know this is a controversial topic, I agree with you opinion of het albinos but not het pieds. Ther are subtle markers on het pieds, not just "tire tracks". From someone that has worked with pieds for almost 10 years now, I've seen my share of hets and possible hets....including many co-Dom het pieds.
Of all my 100% het animals produced, 100% of the 100% gets have had markers including my pastels. Approximately 50% of my 66% pos hets have had markers. Of the possible hets I have held back and sold to friends, 100% of them have proven to be 100% hets.
I am not stating ALL lines have markers, but there is a solid reason why the largest producer of pieds in the world held back his pos het females and sold the 100% hets when building his collection. He picked them out visually. I can do the same with mine.
As mentioned though, it's best to buy from someone you trust.