This film roll is interesting in that it doesn't point you to the location of resources; rather, it points you to an item you can use to gain some valuable stuff. Located in the Safety Deposit Room, grab the film roll by keying in the proper code to unlock the locker its sealed in. Though, you're by no means required to develop the film roll to get the items its photograph hints towards, but it does help direct you towards what you need to do
The storage lockers were a “pilot,” the kind of small test that city government frequently uses to test a new or controversial idea. The city offered up the lockers for individuals to use for months-long stretches. At the time, city officials warned that “misuse of the lockers, vandalism, or other unanticipated results,” could force them to cancel the project.