Yes, aren't there several possibles as to who are the prisoners? I remember reading a lot of the conjecture years ago- haven't checked into it lately. It does seem very possible these could be ID'd!
Anyone know a current status, please? It's ok to post the image, talk about public access! May wish to get it from LoC or National Archives- I hear there's a ' thing ' where it's possible to claim YOU scanned or otherwise made one of these old treasures ' yours ' , and some of those cases win when making claims of infringement ( isn't that ridiculous? ) so please be careful.