Hopefully there would be others but this is what I have so far.

Unreleased Songs:
Backdoor to Heaven
Does Anyone Really Fall In Love Anymore
Growing Up The Hard Way
Judgement Day
Love Hurts
Now and Forever
River Of Love
Rosie - Richie's version is on Stranger but you never know
In America
Cadillac Man
We All Sleep Alone - Richie song but you never know
House Of Fire - Long Shot
Alice Doesn't Live Here Anymore - Super Long Shot

Songs That Could Be Included:
Diamond Ring (Original Version)
Love For Sale (Full Version)
Let's Make It Baby - Although released, it could still be included
Love is War - Although released, it could still be included