How are movie extras notified whether or not they have been cast?

On June 4, 2011 I went to the open casting call for the movie Funsize in Cleveland. Since then I have not been contacted by the casting directors. I figured, since it's only been about three weeks, they hadn't decided on extras yet, except that filming (IN MY CITY!! :0) has already seemed to have start, like a street is closed off and Victoria Justice, the star of the movie, is in my city signing autographs. So does this mean I haven't been chosen as an extra? About half of the people who came to the casting call were to be selected, so 1,500 people. Would they notify you whether or not you made it, or only if you were to be in the movie? Phone, address, and email were given; which would they use to contact an extra? Thank you so much.