Just wanted to update you all on my timeline! I was pretty nervous because I didn't do tracking and only did one set of prints.
Package mailed to FBI on 10/03/2017 (Mailed from Nebraska)
Received by FBI on 10/06/2017
Credit Card Charged on 01/19/2018 and FBI Background Check completed same day.
FBI Background Check mailed out 01/22/2018
FBI Background Check received 01/25/2018
The funny thing is.... I just received the extension today from CIC. They extended the due date until 02/24/2018. Here's the back story if anyone else has a similar experience or has questions. On 11/09/17, I received the message in GCKEY that CIC requested the Medical Exam to be done and the FBI Background Check. The background check was due on 12/17/17. I did the medical exam right away, but I knew that I wouldn't receive the FBI Background Check until January sometime. I uploaded the typed explanation in GCKEY that same day and waited. I heard nothing back, so I did a case specific inquiry on 12/13/17 and asked if the letter I provided was acceptable, as the document was due in a few days. They still never got back to me.... I was kind of getting a little worried because I heard of other people getting extensions pretty quickly.
Another issue was that GCKEY wouldn't let me upload another document and I knew that the FBI would be sending the document pretty soon. On 1/23/2018 I took screenshots, showing that there isn't a way to upload the background check... then a couple days later I receive the actual extension. At the bottom it states, "Please send the document/s information to the address lifted below" (CPC Mississauga). "For faster service, you may send the requested information/document(s) via the Case Specific Enquiry form.
Sorry for the huge response! I just knew I always had a ton of questions and wanted to help out with anyone else on this forum.