I still have the Chek Lap departure scan with no arrival in Alaska, so I guess it's safe to assume UPS 21 wasn't the one after all.... Will be going to bed soon, so will check again first thing in the morning.
So here's what mine still says at iShip:
4/2/2010 4:24:00 AM IN TRANSIT TO GUANGZHOU, CN
4/2/2010 4:23:00 AM DEPARTURE SCAN CHEK LAP KOK, HK
3/30/2010 11:26:00 AM ORIGIN SCAN SHENZHEN, CN
3/29/2010 1:00:00 AM UPS INTERNAL ACTIVITY / UPS INTERNAL ACTIVITY LOUISVILLE, KY US
4/2/2010 11:06:00 PM BILLING INFORMATION RECEIVED CN
Exactly what I have. Let's see what plane we make it on...