Well I finally talked to the woman at WalMart that has been avoiding me.
I told her my story, as I expected she " has no idea" how it happened.
She also told me that if they take the time to look at every fish that comes in they'd get nothing done.
Also would not share with me the name of their fish supplier. Big surprise.
THEN she also told me that she's bought fish both at her WalMart and fish at PetSmart, and the ones at PetSmart died within a few days. lol I bored her for a good 10 minutes with the story of how several of us go around rescuing fish, etc. etc. and how many of us have rescued fish from WalMart. blah, blah
She was basically about as helpful as talking to one OF my fish.
I guess the case is closed, I'll never know how it happened.
I don't really care anymore, though, as long as I now know that he's going to make it and lead a somewhat normal life