I think if you go back you will find as said above the first ones were in the square ,yellow/black box, then there was a grey one that had a smoother finish ,not the tecture the current ones have and it had a small metal ( maybe plastic) name plate glued to the center of the lid, and then the grey , rough textured cases , like the current ones, but had a different molded bottom, as they would NOT stack properly, also the end of the plastic cases had changd over the years, so they could "add" the labels on them, and nOT the carboard shippers they came inside of and then there was the black boxes.........I looked through my old cases but could not find the early ones to take a picture of them.....
I do have some of the more current style ones, grey and I'd let them go for $15 and whatever the shipping would be to you.........let me know by e-mail