Were these pre-Buckingham Nicks songs performed?

[PenguinHead]

I'm a big fan of all various incarnations of Fleetwood Mac prior to Buckingham Nicks. I really love how those songs were adapted and performed when Lindsey and Stevie joined. Songs such as:

Station Man
Tell Me All The Things You Do
Sunny Side Of Heaven

Hypnotized

Oh Well
Green Manalishi

Get Like You Used To Be
Believe Me
Why
Spare Me A Little

Frozen Love
Don't Let Me Down Again

All of these songs have emerged on various live bootlegs. But I've seen some documentation that other songs were performed:

Child Of Mine
Just Crazy Love
Prove Your Love

If this is true, how did they escape all the bootlegs out there? And, as an off-hand comment, why didn't they play more Bob Welch songs -- Sentimental Lady for example?