I've been watching these on Ebay for months, but was on the fence due to poor photos. I bit the bullet and bought a set - a long shot ...
I was surprised and amused that the rib side containers had the "rib" missing across the mid section. This is because the set comes with lettering - stickers!

I'm guessing this set is circa 1970s - gotta love some of this early N scale!

The containers are 8' and actually scale out to 40' and 20'. The only one that I think I will end up using is the 20' "smooth" side, as this was a common container in the early 70s.
Wasted money for the most part, but at least I now know what's what (and here's the historical document).

Mark
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