This is one of the worse days of my life. According to a letter I just received I failed to file my 2011 school income tax. I KNOW I did, It was around 50$ and I paid it in a money order, but I can find no documentation saying I did so, probably because it was from two years ago. This is a night mare. Is there ANYTHING I can possible do to prove that I paid? I've searched top and bottom for that receipt. What damage am I looking at if I can't find any proof?