Shipping is crazy unpredictable. I shipped four packages out three days ago, on Saturday, from the same counter, same shipper, within 10 minutes of each other. One was to Belgium, one to The Netherlands, two within California. The one to Belgium is now in Brussels, The Netherlands-bound has only made it to LA, another one to a house a few hours away won't be delivered for days (!) and one close to that was just delivered tonight.
I think they're all just tied to helium balloons or seagulls with tracking.