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I don't have Sigil installed, so my screenshot is from Calibre Editor instead.
You should see the font file in the list of files on the left.
Then in the stylesheet, there should be references to those fonts.
If you have reinstalled fonts from your own system, it is possible that they are not an exact match and the name or family name might be slightly different to what is shown in the stylesheet.
Have you run the EpubCheck option in Sigil? It is a plugin that is installed which verifies the validity of the epub file.
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