I'm glad she's doing better, beautiful little fish!!
I personally can't recommend a Customs broker in your area. I would highly recommend staying away from any of the BIG guys, most brokers/freight forwarders with a million offices over the globe aren't reliable as a whole. Not to say that some offices aren't better than others but I wouldn't move a shipment with them for my worst enemy
If you go to the Customs website
www.cbp.gov you will want to click on "Trade" & under "Resources" you can find a link to ports of entry listed by state and there will be contact information. They are not always the best at returning phone calls so I won't say that I'm surprised you never heard back. If you can get a person on the phone, you can ask them for a recommendation for a Customs broker as they will know who is reliable and who is not.
The website for F&W is
www.fws.gov it takes a little more navigating to find the right office, but you will want the Law Enforcement division. I personally find them far more helpful than Customs & they are good at returning phone calls.
Just an FYI too if you decide to hand carry a fish back from overseas again, the Customs broker will need your flight details & have to meet you at the International Terminal for the Customs release. The broker will also coordinate everything with FWS as they may need to be there as well to release the fish. Your entry fee will be higher if the broker has to meet you at the airport as opposed to you having the fish shipped as cargo.