When Hotwheels released the Corgi castings,my Hotwheel mania was at its height.
I remember in '97,Mattel had small cases of cars from the regular 72 count cases,which they sent to supermarkets,drug stores,variety stores,etc.
We called them "China cases",as all of the cars were made in china.Most all of the cars were re booted Corgi castings.
I don't remember any of those castings in the regular assortments,only the short cases.
Also,that year,there was a 13th First Edition,a sublime green Cuda.
It was never on a proper FE card,just a regular blue card,and was only ever found in the short cases with the Corgis.
Also while I'm on those old days,you could easily open 20 or more of the same case and not find a Treasure Hunt.
They were really hard to come by,even for us hard core HW hunters.
Mike