Counterfeit?

I tried to enter a new $10 bill with the prefix FES and get an error message saying that such a prefix does not exist. Does this mean the bill is counterfeit?

I believe that series has not been entered yet by the site administrator. He has been emailed and will add it to the list as soon as he can! Do not throw the bill out……it's a good one!

PS….keep an eye on the cdn money forum and dr will post when that series has been added to the list