Possible find
From The Lost Media Wiki
I just won an eBay auction for a used blank tape with 3 episodes of Dumbo’s Circus on it (as well as 2 1/2 ep’s of Pooh Corner), so crossing my fingers some of them may be undiscovered ones. I’ll try to post about it once the tape arrives!
In the meantime I’m gonna try and update this page a bit– some of the YouTube vids linked are now privated, and a few ep’s that’ve been found since that last time this article was edited.