Looks like you can track the ABC tracking number on the usps site as well.
Label/Receipt Number: RA88 xxxxx xxxH K
Associated Label/Receipt:
Detailed Results:
Foreign International Dispatch, January 24, 2009, 4:17 pm, HONG KONG AIR MAIL CENTRE, HONG KONG
Foreign Acceptance, January 23, 2009, 4:28 pm, HONG KONG