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What proof do I need in Community Service? - community service confirmation letter

Excerpt from a letter I to my teachers:

A friend of my mother found me a community service (for food, shelter or so) for the rest of the summer. She said she did not have proof of my service to the community, and everything will badge, among college. Somehow I do not believe what she said ... You do not need proof for my services as my own words? As a confirmation letter from the research director of food, shelter or something ...