So I've bought a really really old char. After giving away over 10 millions worth of /droprep, I seem to have an IFF which does not exist in my repsheet.
Your rep may be green with a faction, but you may never had met said faction ingame. Which means, you have the IFF for that faction, but it isn't on your repsheet becasue you've never met that faction ingame
Second hand ships come with very few guarantees it seems ... Cheap ain't always best.
A trip round Sirius to meet a few of the locals will show you which repsheet factions are missing.
Some say he is a proud member of: "The most paranoid group of people in the Community."