This question already has an answer here:
I want to get a list of bib-keys from my
.bib file which I don't actually use in my document.
I have found "Unused bibliography entries - how to check which entries were not used?" but since I'm using biblatex I don't have the information in the
.aux files, so I can't use checkcites.
Is there a biblatex way to get such a list?