If La-La Land took out an Errors and Omissions insurance policy, maybe it will cover the cost of a "bonus" disc with any missing material (once we create a definitive list) sourced from the best available material.
If there were 150 tapes, each containing up to 30 minutes length averaging about 17 minutes a tape (as I doubt all were full), that comes out to ~ 42.5 hours of source material. The CDs run time is ~ 17 hours.
I did order a copy, btw...