The two gentlemen in your picture 15 appear to be wearing some sort of uniform; and the fact that they have been photographed together might suggest they have a family link -- father and son, perhaps? If I was to take a wild guess, I would say they might be railway clerks -- but that is just a wild guess. If anyone on here could positively identify what uniform it was, that might prove helpful to someone trying to confirm whether the album was theirs or not i.e. If such a person happened to know that they had two deceased closely-linked relatives who followed this profession.
Also, it is definitely helpful that you have given us the geographical area where photos were taken, since this suggests where people may have been living at the time, and who might then have been immediately related to whom. Might help someone to feel more confident about whether the album is theirs or not -- assuming they happen already to know quite a bit about their family history; although can also throw in a few curve balls.
I myself inherited two beautiful Victorian photo albums through uncertain line of descent through the family, and have spent many hundreds of hours puzzling over the sitters, trying to work out who they were/might have been. The photos for dating and restoration forum on rootschat has seen a lot of business from me through the years, as getting firm-ish dates for photos once you begin to get a feel for who sitter might be is very helpful.
I certainly agree the suggestion that you contact a local newspaper to try to get a wider circulation in your geographical area for the photos, should they prove not to relate to your family.
Best of luck with this journey!
CELTIC ANNIE