You're right. They do not begin interviews until September...September 29th to be exact. In regard to your question, the AADSAS website provides information about the status of your application. If everything is complete, it will say so and you will receive an email stating this. Ironically, AADSAS never sent me this confirmation, and supposedly they are still waiting for my evaluations (which isn't true because other schools have confirmed that they received them). Basically, AADSAS is not responsible and it is important to follow-up on everything with the individual school. Some schools also use infosource.com to tell applicants whether their application has been received, but this is on an individual school basis.
Also, I only posted this thread simply for information. Personally, I would be curious to know when a school started to interview so I assumed other fellow sdners would be too. It's also important to remember that this process is also part luck. My application may have been in the right pile at the right time. But thank you to everyone's congrats.