First the follow-up on the company.
I received email from the Senior VP of marketing for Jensen Distribution, and he asked the longest-serving employee of 46 years (who happens to be the President of the company) about archives--nope, nothing.
In a follow-up email, he stated that they probably vacated the building before 2000.
Some clarification. I meant #6 drywall ANCHORS!
they are pretty close to the same size as a .22lr cartridge with only a slightly thicker "rim". They are far more durable than the purpose-built snap-caps