That's it Isaac, Gasoline Alley. Been dealing with them for the last 25 years, but much less these days. They were there before ebay!
You're right, it may just have been crumbling foam that made them look used - on some of them, I couldn't tell one way or another.
Wrong category usually doesn't matter: I, and I assume many other collectors, usually check all the possibilities, altho these days I'm less systematic about it - and the couple times I've spotted a gem in the wrong place, well, I wasn't the only one! Far from it...
Many years ago, I did find a Monogram 34 Ford in the HO section - but there were still 2 of us bidding!
Actually, at the time, except for that Dyna and a Versitec SS101, I don't think I bought any other commercial rewinds - it was all roll my own, for better or worse...
Don