Rattlers with white foam insert

Anybody have info on these? I have been told they were part of the first 50 done, others have said they were temporary while waiting for different sized gaskets. Post your thoughts or conspiracy theories here.
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P.S. That's not foam!
-Paul
The Penny Lady®
<< <i>Wasn't there a lawsuit about them?
Why, what, when... As Air-Tite holders use the same foam w/ no issues.
Russ, NCNE
In honor of the memory of Cpl. Michael E. Thompson
Russ, NCNE
My theory is that the foam was an attempt to preserve the color of copper and CN coins as best as possible. The rattlers were some of the least airtight slabs around, but once moisture/humidity got in, it is tough to get out. A secondary (long shot) theory I had was that the foam was a way to prevent smooth-edged coins from rotating and rattling around in these holders. The rattlers did have prongs to try to hold reeded-edge coins in place for a while, but they often broke and ended up rattling. The prongs didn't work too well with smooth-edged coins.
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Russ, NCNE >>
Awesome!
<< <i>This thread should be revisited, very interesting. I have never seen one! >>
I have several rattlers in my collection but never knew these existed. Thanks for the trip down memory lane.
Mike