Hopefully this will be allowed to be released. But I have to agree with what was said here that if it hasn't been found until now, odds are that this thing won't be found elsewere. But I'd love to be proven wrong. Hopefully Darth Neo can get permission to have this released to us. But I do understand why you aren't releasing it and it wouldn't be right to just go out and start copying it like mad and distributing it everywere. But I hope you do understand our excitement on seeing something new unearthed on this.

As for why it was never made public, it sounds like it was, sort of. At least one person here saw it in Canada, so it at least aired there. From other posted comments around, it sounds like it might of aired elsewere, maybe on some local stations. It is rare today, probably because it only was aired once, and never got a home video release, like SPFX:ESB did. So it got forgotten about, which would be easy to do, considering that due to the age, and the prominence of the similar SPFX:ESB special. But the ultimate reason why it was never released probably will never be known if your sources where you got the tape don't know. We can only guess.

Welcome to the forum and enjoy your stay!