More good questions, Dan.
Regarding the Diaz Cigarettes RC's. since there are a number of examples known from this set with multiple copies of their cards, I think that it is safe to assume that they are not unique examples, very tough to find, for sure but likely not unique.
Same thinking would apply to the Star Player Candy issue as well as the couple of others that you mentioned. I have seen the Hack Wilson & Early Wynn, each is very scarce as well but not unique.
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