"Customs Clearance" for five days? Should I be worried?

As many of you know, I recently returned my 50mW DL Spartan 50 to China for an RMA. The laser arrived at ISC (which I assume means International Shipping Center) on the 19th. When the tracking status changed to "customs clearance", I thought that I was in the clear and the laser was on its way to China.

Now, five days later, nothing has changed. Is this normal, or should I begin to worry?

Thanks,

Rob