So the police didn't have any of the photos? I assumed Bruce made copies of all evidence he could in case it went "missing" at the station and/or he needed to see patterns in later cases.
Assuming there aren't copies: unless Barbara knew the exact amount of pictures Bruce had, whether he fibbed or not, she wouldn't know if any were missing. Not unless he left the negatives which would be very reckless of him. And if she did figure out there were pictures missing why would she look in Boosters' file of all places? Granted she might demand Alfred or Dick tell her where they went but I think she'd want to keep this to herself first. KJ has never been easy for her to talk about.
The only semi-connection I saw to this outside BG was Barbara having the camera in BOP Origins and Omens. She says that Bruce didn't want to give it to her. But that's all that was mentioned of it.