There are multiple threads regarding tariffs and philatelic materials. Although the matter was settled there continued to be numerous SCF members who refuse to accept victory. This matter is now concluded, at least by CBP. I am sure it won't be enough for some folks but that is their issue to deal with.
This is the final say from 30 October on philatelic tariffs. You can find all of this on the Boston 2026 website which I have also linked below.
https://web.cvent.com/event/bbbdc1d...a3a8ae931f05