help tracking a package from Austin Tx to the China Province Quingdao

Hi sent package back to the china province june 9 and the tracking number says it's in chicago here it is July 3, 2013 and still the supplier claims she has not recived the package. I called US Postal internationl they said once it's goes through customs, there is no way they can track it and i need to contact the supplier help and she is not very helpful, my tracking number LC727561595US.