Exactly! So again, any 10+ round Glock mag made during the ban would have to be stamped as restricted for LE/gov. Therefore, any such mag that does NOT have those markings, is pre-ban (with the exception of the post-2004 mags with ambi notches). Right? Seems pretty straightforward...I suggest reading the old Fed Law wrt what was required for a marking. IIRC a date wasn't required, but the words LE/Mil Only were required.
AFAIK, NOBODY marked mags that way until the Fed Ban came into being. There was no reason to do so and it wouldn't provide any marketing advantage.
On the other hand, EOTech puts LE/Mil markings on their sights and when the Fed Ban happened some mfrs put LE/Mil Only on their AR lowers to ID it and perhaps for marketing purposes. I suspect some mfrs continued the LE/Mil marking after the Fed Ban expired as a marketing gimmick . . . as people always want something "special" that LE or Mil have. But no such markings were required for guns before, during or after the Fed Ban (only required on mags during the ban).