True Believer hasn't seen light of day.
Have You Seen Her? is supposedly titled "I'm Over It Now". Only played at one show that we know of -- Supper Club, NYC, 10-26-97, no confirmed studio version. He could have played it more but no recordings have surfaced. I hope someday some news comes from this one, it's always been a personal favorite.
We're All Friends Now was only live too -- here's the video: https://www.youtube.com/watch?v=wlt03-c-e0k
I'm guessing there's no studio version of it since it hasn't been mentioned and that time in Elliott's catalog is pretty accessible as far as unreleased things go, especially lately; I haven't heard any mention of it.
I'd also suggest, if you haven't already, to see the Heaven Adores You soundtrack and film. It has more unreleased stuff from the early eras.