Someone is feeding my dog............?

Well my dog is the only dog in the whole nieghborhood who will start barking hysterically if someone is on our land or in the neighborhood late at night (or a new person). Well lately she's been barking really late at night and escaping and when we let her out during the day she escapes again. At first we thought she kept on breaking our fence or digging holes or we forgot to close the gate. But then we relized someone was actually doing this! And lately my dog keeps on coming home with food. At first it was a can of Pedigree dog food and today she brought home a bone! My mom thought of this is someone trying to become friendly with my dog so she will no longer bark at them at night? Please help what should I do? I wanted to go follow my dog at a distance and bring my camera so I could take a picture of the person feeding my dog but is that dangerous?