Good question, Scott. I think Mr. Burdick did an incredible job of documenting / cataloging sets, based upon the information he was able to find, in an era where information didn't flow around like it does today.
My sense is that on this set, he probably had never seen a wrapper. I can think of many other sets that we now know aren't properly categorized / named by him due to incomplete information. Star Player Candy comes to mind as it was called Anonymous Candy for decades before the discovery of a full box that revealed the manufacturer and the name used to advertise the set.
jeff
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