Sony owns a considerable amount of Nas' catalouge, brother.
The Lost Tapes 2 could look totally different depending on which label put it out between Sony of Def Jam. I'm a huge fan of Nas, especially his unreleased music. It is highly doubtful that they'd do a combined Lost Tapes.
The version from Sony could possibly have tracks from this list since these are known Sony era unrelased tracks:
1. America's Top Brothel
2. Crabs in a Barrel
3. I am Somebody
4. Understanding
5. Among Kings
6. Stay Alive
7. My Worst Enemy Is Me
8. Rise and Fall
9. Seeds of Heaven
10. You Don't Know Me
11. Tales From the Hood
12 . Never Gonna Give it Up
13. Your Mouth Got You In It
14. When Thugs Die
15. High
16. Sucker MCs 2007
17. Death Anniversary
18. MC Burial
19. Two Seater
20. Anybody Test
21. I Already Know
22. My Will
23. Curse
24. Stay Schemin
25. True Dialect
A version from Def Jam could look like this with known Def Jam era unreleased tracks:
White Man's Paper
No Such things as a White Jesus
Life Is Good (title track)
Hope (Original)
Proclamation
The Fear
What it is
Be Right
Courthouse
America (Original)
Snitch Alibi
Who are You
Colors
Living It
Life's Gone Low
NY Stomp
Black Girl Lost pt.2
You are right though. One of the labels needs to drop something.