Most of what's available are alternate takes of the released songs. The circulating songs that were left off both albums ended up being released as bonus tracks on the recent deluxe reissue of the 2 studio albums which came out last year.

there's one called "Vol.2" which covers the sessions for the first album, and another called "Vol.4" which covers the sessions for Volume 3 (ie, the 2nd album). these bootlegs came out soon after the original albums were released in 1988 and 1990. there are some variations on these titles in different versions but they all pretty much cover the same stuff


Traveling Wilburys Vol. 2
Walk Away
source: Official releases and outtakes 

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Tracks:
Walkaway
Nobody's Child
The Trembler *
Crying
New Blue Moon *
Under The Red Sky
Theme For Something Really Important *
Don't Treat Me Like A Stranger
Every Little Thing  (extended version)
End Of The Line   (extended version)
Handle With Care (extended version)
Runaway
Outtakes:
Last Night
Congratulations
Dirty World
Rattled
End Of The Line
Heading For The Light

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Review:
This is a great quality package. The cartoons and photos are wonderful. The problem is that they were simply lifted from various official releases. The songs are all listed and identified properly on the cover and disc... and the sound quality is great. The problem is, here again, that two thirds were taken from official releases. That makes this disc mostly a pirate CD. The only partially redeeming fact (at least as far as the USA buyer is concerned) is that the various legitimate 5 inch single German discs that were the donors of this material were all but impossible to locate in the USA. Still, that doesn't make a pirate disc any easier to give the nod to. Some of the blame here has to rest on the shoulders of Warner Brothers, however, for choosing not to make all of the special release products available world wide.













Traveling Wilburys Vol. 4
source:  Wilbury Vol. 3 outtakes

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Tracks:
Wilbury Twist
New Blue Moon
Seven Deadly Sins
Cool Dry Place
Runaway (Del Shannon)
Maxine
Inside Out
Where Were You Last Night?
You Took My Breath Away
Poor House
If You Belonged To Me
She's My Baby
The Devils' Been Busy
Like A Ship

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Review:
This CD release covers the working tape for the Bel Air sessions that would produce 'Traveling Wilburys Volume 3'. The sound quality is great. The best thing about the tape is the additional Dylan track 'Like A Ship' which is totally unreleased. The package is sparse. No info is listed. The tracks alone are listed on the back, but in the wrong order. The CD play order is listed above.





Source : http://www.bobsboots.com/CDs/index.html