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On the off chance they just mistakenly left in the encryption.xml file. you could try starting with a fresh copy of that epub, unzipping it and removing just the encryption.xml file, then save it. Try that. If the fonts still do not work, then they are still obfuscated and there is no way to recover them without the proper content.opf unique book id metadata value.
Might be worth a shot.
Alternatively the encryption.xml file may simply have the wrong paths to the font files in inside that epub, those paths should be from the root of the epub, NOT from the META-INF folder itself. If so you may be able to just fix the paths in the encryption.xml file, and everything may work as designed.
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