Same with me. The 6 I ordered is showing with a serial # (that doesn't work in the above-linked site). The 6+ isn't showing yet.
I can also find a tracking # for only one package - UPS, by billing phone #. The second reference # doesn't match the serial # of the 6, or even the remotely same format. I can't find the 2nd package in UPS or FedEx, and I don't know which one I found in UPS (though I'd guess the 6 since that's the one that seems to have a serial #).
Same situation here. The serial of my 6 does work though.