Your application will very likely be returned...but not in the next few days...or even weeks.
Once CIC receives your application, it sits in a pile until someone is able to open it and do a basic, cursory `glance' over it to ensure that all required forms have been included and that all required signatures are in place. Once that has been completed, they send the AOR (Acknowledgement of Receipt) email, which says that your application was `oficially' received on [date]. This date will be the day that it was delivered to CIC, which will match your delivery confirmation/tracking information, usually.
The problem is two fold...the first, is that it takes CIC a month (or more) before they do this quick glance. Once they do return your application to you, it will also be possible that one or more forms have been updated. You would NOT want to send back the old application package without first verifying that none of the forms (including the Document Checklist) has been updated by CIC. Simply check their website the day that your package is returned.
The second, is that some people never receive their AOR.
If you haven't heard anything by early November, you might want to call them (ug!) and see if they can find your application.
Good luck!