For some reason the Cardholder Fingerprint and Facial Image cannot be used as keyfiles. They cannot be exported either. The so called "Printed Information" can be exported as a 30-byte file. The fifteen 16-bit hex numbers are related to the PIV management key (I am not sure they are the same though, because the management key is 24 bytes long). I was able to use it as a keyfile for a test volume, but given the guidance for a 64-byte minimum-size keyfile, I am not super keen to use it for a critical...
For some reason the Cardholder Fingerprint and Facial Image cannot be used as keyfiles. They cannot be exported either. The so called "Printed Information" can be exported as a 30-byte file. The fifteen 16-bit hex numbers seem reasonably random, but I don't know what information they actually correspond to (and I haven't been able to find documentation of it). I was able to use it as a keyfile for a test volume, but given the guidance for a 64-byte minimum-size keyfile, I am not super keen to use...