Yes they do try to match your "story" to the pictures your sent. This is what I understood from reading my caips note. Everything i wrote was supported with pictures i sent them. Hubby interview was waived!
I had a very small wedding, 15 persons total: my parents, my 3 sisters, his nephew, his 2 childhood friends, and best friends of my sister and brother-in-law. None of his family member could make it because of visa delays issues.
So it is not the # but whatever you are supporting in telling your relationship story.
My VO asked that pictures was not be stapled or elastic. I simply put a tag on the back with names of the person, relationship to me or husband, date, and location.