Yea I got a UPS tracking number that doesn't yet work either from AMS, , I think its just a case of UPS being slow to update (i hope). I would say just keep checking, if you don't have it by tomorrow afternoon calll them for the reason.
My last shipment arrived at my door before the tracking info even showed up as being shipped on UPS site. Funny thing was that order was a 2nd day air and arrived early the next morning. Of course the order before that was a 2nd Day air that took 4 days to get here, so I don't hold alot of confidence in UPS these days.
My Guess would be they would ship from NJ as that is where they always seem to come from but I don't know.