If the package was sent either airmail or Global 
Priority, there is no way to track it. But it is 
possible for them to do a search for the item 
(there is a form for this that the seller should 
be able to get). It doesn't have the highest of 
success rates, but they do find lost things once 
in a while. I'm pretty sure that the search is 
only conducted on the US side of things - meaning 
that if it got lost after leaving the US, the 
seach isn't going to find it. . . In which case, 
I don't know what you'd do.  ;_;  Good luck!!

Many Sharp Smiles,
--Drac