I used to own a few Baker St John romance that were supposedly Church copies, bought in a Heritage auction long back. They were by no means pristine copies, and I seem to recall a discussion some time ago on the boards in which it was suggested that when Edgar could not get copies from his newstand, he went in search of other copies. I only mention this because I wonder if poor distribution of certain 'late period' books might have been a factor, and we know that Planet #65 is/was a scarcer than average Planet.
Any thoughts?