Actually they could be reference link numbers - is there a numbered reference list at the back of the book, and do the numbers embedded in the text bear any relationship to the reference with the same number.
I suspect those quotes may be from the correspondence between E and S on the latter's thought experiments on cats in boxes and all that, and E's statement claiming God doesn't play dice etc.
If they are such - then you might want to 'fix' them in the editor by recreating the links.
BR
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