How do I get a copy of an award letter?

You will need to provide more details to get any useful guidance. What is this "award letter"? Which office issued the letter? Are you the beneficiary of the letter?

If you are the beneficiary, have you asked the office or person who sent the letter for another copy?

If you are not the beneficiary, do you have any legal claim to a copy of this letter?

Perhaps you should repost with much more details. Or, you can review your facts and options with an attorney who likely can give you much better information since the attorney will be able to find out what it is that you want.