T2 item BPOs came from a special research agent lottery, and 99% of them were handed out roughly by the beginning of 2005 (I remember some friends winning an occasional straggler in late 2005 and beginning of 2006). Hard to remember now, but I believe 20 of each T2 ship BPOs dropped, and 40 for each module (that existed at the time, of course, so no versions for things like Command Destroyers).
Somewhere I have a basic industrial alt that I haven’t logged into for over a decade now with a handful of the things.