Apparently the slow boat from China doesn't end in San Francisco!:
October 2, 2013
Depart USPS Sort Facility
BOISE, ID 83708
October 2, 2013 , 6:31 pm
Processed through USPS Sort Facility
BOISE, ID 83708
September 29, 2013
Depart USPS Sort Facility
SAN FRANCISCO, CA 94128
September 29, 2013 , 2:05 pm
Processed through USPS Sort Facility
SAN FRANCISCO, CA 94128
September 28, 2013 , 2:16 pm
Processed Through Sort Facility
HONG KONG AIR MAIL CENTRE, HONG KONG
September 19, 2013 , 3:54 pm
Acceptance
HONG KONG
My guess is that after San Francisco the boat headed up to the Columbia River and is now heading up the Snake River towards Idaho Falls, ID! And based on the speed it seems that they are rowing!