I am not sure if this is a coincidence but seems unlikely...
I spoke to a rep via chat and was able to find out my package will be shipped via UPS.
I went to UPS and tried my account number as the reference, and I received a tracking number. It still is not on its way, but a label was created and at least I have a number now.
In case anyone is in a similar position and wants to try: I ordered a 16GB silver iPhone 6 (regular, not plus) through sprint.com on the 13th.
Hope this can help someone!
Thanks! This worked for me. Got my tracking number
Order Processed: Ready for UPS
Shipping 2-day from Louisville, KY. No Will-Call through My UPS Choice as I ordered through sprint.com
Ordered an iPhone 6 128GB Space Gray on 9/13 @ 9:13PM
So Excite!