I wonder what happened in the aftermath... just ran into this while looking for something.
On jul/fri/04 approximately XA00, I called FSS to file an international flight from tamiami airport to bimmini, bahamas. At the same time I also filed the flight from bimmini to tamiami airport. At the time of filing, I requested FSS, in my remarks, to notify customs of my arrival at tamiami airport. I asked FSS to notify customs because at the time of my departure customs was closed. Before I took off from bimmini, I called customs to verify my name was in the arrival list but no one answered the phone at approximately XA05. Due to the fact that inclement WX was approaching bimmini, and confident that I had asked FSS to notify customs of my arrival, I departed bimmini to tamiami airport. Once I was airborne, I got in contact with miami radio on frequency 126.7. I activated my flight plan and verified with miami radio that customs had been notified of my arrival, and that my arrival was in the computer system of customs. When I arrived at tamiami airport, a customs officer told me that I was arriving at customs without prior notification. I proceeded to explain to the customs officer the steps I had taken to notify customs (as described above) and also explained to him that, on my way to tamiami airport, I had contacted miami radio frequency 126.7 and that they assured me that customs had been notified. The customs officer then proceeded to inform me in a very rude manner that 'it was very hard to believe what I was telling him.' I then called FSS with my cellular phone and explained the situation. FSS told me once again that my tail number was in the computer system of customs. I related this information to the customs officer and he repeated to me that it was not in the computer. At that time, FSS asked me to put the customs officer on the phone, which I did, and spoke to him. After FSS spoke to the customs officer, the officer acknowledged that my arrival was in the computer and stated that he 'did not care because the pilot had to call customs personally.' the officer then proceeded to inform me that he was going to issue me a warning. I told him that I did not think that was fair because I had followed all notification procedures appropriately. He then gave me a warning, which I signed. After having signed the warning, the officer asked me for a copy of my pilot's license and passport and went to the back office and made a copy of my documents. The officer then told me that I could leave but that I had to be back in 1 hour because his supervisor wanted to speak to me. I proceeded to take the airplane to the ramp and approximately 45 mins later they called me and I went back to customs. The supervisor asked me what had happened and I related everything as it occurred. The supervisor told me that he was not going to give a warning but that he was going to give me a $5000.00 fine instead which I would receive by mail. After that, he handed me a paper (attached) and stated that if customs was closed at the time of my departure, I could have called an after hours number. I explained to him that I was not aware that there was an after hours number and that I had never been given this number before. As it is clearly described in the paper given to me by supervisor, I followed notification requirements as stated in item #2. I strongly believe this situation could have been prevented if customs had made this information more readily available to pilots. Also, in every safety meeting I attend, I have requested an informational meeting with customs in order for them to review all the new regulations and procedures for international flts. I would greatly appreciate if these suggestions are taken into consideration in order to avoid this type of situation in the future.