Registered package from the UK been at ISC NEW YORK NY since 7/28.. Anyone know what to do?

I have a Registered package from the UK when I track it.. it says:

Label/Receipt Number: RJ33 1930 004G B
Service(s): Registered Mail™
Status: Inbound International Arrival
Your item arrived in the United States in ISC NEW YORK NY(USPS) at 6:12 pm on July 29, 2010. Information, if available, is updated periodically throughout the day. Please check again later. .... Its costume jewelry value under $50.. What the HECK?? Called USPS all they tell me is… they do not have it yet.. I said so your telling me it is stuck in customs.. USPS said “No that is not what I said.. I said it has not been released to us yet”... SURE does have (USPS) after NY. Anyone have any suggestions?