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Thankfully some of the 2-inch video tape stuff did survive elsewhere - UCLA has all of "Don Adam's Screen Test" - including the unaired pilot. Jack Benny's 10 color hour long specials survived, and were released on Time-Life, so those existed elsewhere. (May have never been...
The vault that went up was a working vault for syndication for television, as well as used for 35mm theatrical prints for revival showings.
The reason we've not seen a lot of shows from MCA/Revue/Universal Television is they simply don't want to go into the MASTER VAULT (where everything is...