What is the procedure if bank cashier found a fake note?

If the bank gets or finds a fake note, they must take the bank note and turn it over to the United States Secret Service. We take a picture of the front and back of the bill and file it with the persons info (if known) who brought in the fake note. The person even if they didnt know will not get the bill given back to them or are we able to trade them for a real one.