There are many other IPTC fields that are embedded into images that are important and should be made visible/ searchable etc. Original File Number, Date Taken, Photographer, Source, Copyright, etc. I realise some are in the Exif but IPTC is easily edited in programs like photo mechanic and you can insert your own information. Here is a link to the IPTC fields used in Photo Mechanic. Perhaps an option to use any of these or the most important...
http://wiki.camerabits.com/en/index.php/IPTC_map