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This refers mainly to classic US stamps and I'm not certain, but it's possible that some have not yet been discovered used on date of issue.
A couple of things I learned about this from direct experience
First to Jenny's comment about unknown issue dates on classics.
Last year I obtained an EDU certification for US #212 that set back the EDU date by a little more than three weeks. That is still two weeks away from the known delivery date to the P.O. in Washington, D.C. which is the earliest date of issue the stamp could possibly have. No record has survived of the actual first day of issue, so an EDU is as good as we can get.
In the course of doing this I learned a couple of things about EDU status.
1. First of all, the acronym EDU stands for earliest DOCUMENTED usage. This is a new designation of term for what used to be called EKU, i.e. earliest KNOWN use. The point of the name change is to emphasize the fact that the physical appearance of unsubstantiated discoveries is not enough.
2. To change the catalog listing, the new find must be authenticated by one of the recognized authority agencies. Apparently by general consent for EDU the principle authority of choice is the American Philatelic Society Expertizing Service, APEX. They maintain the most authoritative database for this service to the hobby. The lists at Richard Frajola's
Philamercury site are easily accessed reports that are generally up to date, but that site is not an official authority for purposes of reporting new finds. Frajola himself made that clear to me when I reported the new date. Interestingly, the Siskin-Berkin list incorporated the new find when shown the APEX cert, but so far the Scott cat is not acknowledging it.
So the point about the standard catalog not being the best authority for details subject to serendipitous change is a valid critique for things like the EDU of a stamp. It was ever thus.