Sorry I did not notice your questions until now.

Should a person be concerned about cancelling stamps?

Maybe not. I have not heard any prosecutions. The remedy in the Fed Act - redemption of lawful money - is written for "state" banks originally so they are pretty lowly on the heirarchy of humans and regenerate men and women. So I do not see any judge or prosecutor pushing the matter on any status of person.

But that seems to make my point too.