UPDATE: Round and round and round it goes... The nice folks at the FedEx call center in the Philippines told me today that my bass went to the FedEx facility in Pflugerville, TX, which is usually the last stop before delivery to my house. They suggested I call the Pflugerville facility, so I did. A helpful man at the Pflugerville PfedEx Pfacility told me that my bass isn't there, it was sent to Atlanta, Georgia. He gave me a number to call there. A kind lady at the Atlanta FedEx facility checked and told me the bass has never been to their facility. Additionally, she did a little more checking and told me that the last actual physical scan of the package was two weeks ago in Southern California.
Alas, I have lost hope that my bass will ever be found. I have initiated a claim with FedEx to be reimbursed. Something tells me that that process will be every bit as efficient and satisfying as the package location process has been.