For my order, the tracking number was never valid. The reference number was. I had to go to the UPS site and enter it manually, but it worked.
My took a couple days (in china?) for initial shipping leg, non trackable. Then the last 3 days were trackable, using reference #, not the tracking#.
My tracking# was a number on the box, which didn't have anything to do with the actual online shipment tracking.
In fact, my order was for DHL and it never shipped DHL at all.
But in the end, I got it and all was basically fine.