You should start out the letter stating all of the relevant case information. You need to tell the judge your name, case number, charge and sentence imposed.How do I make a letter showing proof of a students volunteer work? Proving that you've done community service is pretty straightforward if you have some documentation. Community Service is defined as volunteer service for an approved NonProfit Organization. Community Service must be completed. Edit, sign, and share community service letter online. No need to install software, just go to DocHub, and sign up instantly and for free.