That was the whole point for me posting that long response. If you look for the things I pointed out in my first post in this thread, you'll be able to tell whether or not the store is a corporately owned store of just a franchise.
Unfortunately this doesn't work. None of the results show the "authorized dealer" tag that Alicia Grady suggests you look for. And because I worked with Cingular, I know the corporate stores and the authorized retailers.
Click on the link I originally posted and put the zip 62703 (springfield) the second listing doesn't say "retailer" just "CINGULAR WIRELESS" all in caps, so i'm assuming it's an AT&T owned store. You might want to call to be sure though. I'm in Lincoln, about an hour SW of you.