After reading the theories and conjecture about silver badges, from deep thinkers like myself (and others), I emailed a former Ludwig employee.
Here's the short version:
1. There were always things like running out of badges and using what they had.
2.If they had to hit certain production numbers they shipped with whatever badges they had.
3. In that era customers didn't care what kind of badge came on a drum.
4. Sometimes the badge manufacturer sent boxes of Blue and Olive badges with the color missing, for "whatever reason", an obvious error from the badge supplier.
5. Certain assemblers that saw only the badge, and not what color it was, and used the silver badges.
6. If there was not an inspector on the line that day, all silver badges could have been shipped.
7. Whatever the reason, anyone who would know has passed on.
My theory is: whatever explanation is the most simple and logical....