As you know, The Gerald McBoing Boing Show is lost media but we got some hope A fellow retro toon enthusiast who goes by the name "AnimeGolem" has out of print tapes which contain compilations of varying items from the show and recently has uploaded 2 ripped VHS tapes and 1 solo item on YouTube
He states the following still needs to be unearth (most likely via VHS recordings of the USA Network airing of Mr. Magoo)
”The Lost Duchess”
“One Wonderful Girl”
“The Armored Car”
"Quiet Town" "Meet The Inventor: Samuel F.B. Morse"
I'm doing a documentary on the voice actor Bill Scott and I'm looking for the episode The Lost Duchess as he is the voice of The Sleuth in that episode, would love to come across it..