Holy old topic, Batman!
Seriously, though, IIRC turns out nothing of real value was on them.
Yep, that's the go, apparently.
I recall one of the TSS players expressing (in writing or in interview) disappointment when he finally heard the acetates - but I can't remember/locate the source doc.
Andrew G. Doe once posted:
Durrie's acetates were auditioned: that nothing on the box was sourced from them should say something about what was found to be on them.