Are there any shorts that were never released? I am sure of all the Curly episodes there has to be some that never made it to print. Perhaps some that are on VHS only but not DVD.
All of the Columbia shorts have now been released to DVD thanks to the 'Ultimate Collection' boxed set.
The only short we're really missing is the 1933 MGM short 'Hello Pop' (in TECHNICOLOR!) which was thought to be lost forever until a print recently turned up. And believe me, I won't rest until I get my hands on that one!