I know it sounds crazy, (some say i am)but there is a site on the internet where you can put in the serial numbers of the bills you have and watch them move around the country, world, etc. of course you have to be patient. the more people who know about the site the more chance you will have of finding where your bill is. Last week I entered about $200 in bills. It will take time. I am going to add a few dollars here and there and check once a month. wouldn't it be funny if one of my dollars ended up in your hand? Here's the site:

http://www.wheresgeorge.com/