So recently I was investigating two different series by the name of Fay and The Montefuscos and while looking into the latter, I came across a newspaper article from 1986 that mentioned the show, which is fairly interesting considering that the show was aired and cancelled eleven years prior.
Since most of television back in that era was satellite-based, cable networks were known for being lower-quality (this is from what I know, so if I'm wrong, feel free to correct me). However, this 1986 article mentioned that many "dead" shows were somewhat still living on cable networks, Lifetime being the major one listed in the article, but others included USA and CBN Cable. While they didn't air fully as series, episodes would still be brought back from the dead and aired on these networks every weeknight.
What this means is that the obscure shows that we work with and try to recover could have aired up to twenty years after their former cancellation on these cable networks, which really open the time window in which we can work with concerning television recordings on VHS and the likes, albeit the odds are still slim.
If you want to give the article a read, here's a snapshot I took of the article, but I'll also add the link if you want a higher resolution scan (damn snipping tool and its image compression). Article can be found on Page 80 here