Many years ago WB was in a period of transition, moving their music masters from a specialized music-only vault into the general inventory system. During that time, I asked about some masters and was told they didn't exist, and I think I reported that—which was in error. Wait Until Dark was a case in point. I have not specifically asked about Chisum and The Train Robbers since then but I would be very confident they are in the WB vaults. It's typically things that were recorded overseas (Stop the Revolution I Want to Get Off) or were independently produced (Black Belt Jones) that they don't have. But the scores recorded at the WB stage by Dan Wallin are almost always in the vaults and sound phenomenal.
Lukas
I would love to see releases of Chisum and The Train Robbers one day.