theaudiotweak,
Obviously I know a heck of a lot more than you about these things. I have no doubt the supplier stuck a sticker / backing on them, I understand some had a magnetic backing, perhaps he attached that. Makes it convenient.
However, given the website, writings of the owner at the time, etc. there was no indication at all of the ability to technically verify such items, to manufacture them, etc. Feel free to put forth evidence that proves me wrong.
A product such as this would require significant investment to develop, prepare manufacturing tooling, etc. test, etc. So where is this product now? This would be an estate or corporate asset.
It sounds like you got taken in by paying 4x for an audiophile branded EMI absorber. Don't get mad at me.