According to otter the following shows are known to exist but are missing from my collection.

 34/08/10  139  The Stooge Murder Case
 39/12/xx  353  Christmas Shopping for Perfume and a Necktie (West Coast)(39-12-17)
 40/05/xx  373  Clown Hall Tonight (West Coast)(40-05-05)
 46/12/08  599  Jack Buys Don Shoe Laces for Christmas
 52/11/23  822  USC-UCLA Game
 54/09/24       Rehearsal for Broadcast of 54-11-21