Update - I have an image of a series 5 cello with no insert. I know quality control wasn't then what it later became (the various amounts of cards possible in 1966 cellos proves that), but it seems likely series 5 was issued without inserts.
Recall, there were 4 wrapper variations - one with embossed, one with transfers and two with no inserts advertised. I suspect that means that at least 2 series had none.
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