Don't bother. US customs has not actively gone after "camera stuff" for about 15 years. As long as it is not new in the box, they do not care (for that matter camera prices in the US have been the cheapest in the world for over a decade so only a fool would be grey market importing a camera). For that matter Filipinos are some of the happiest snappers on earth and most travel home every year so I do not think it would be a problem (again as long as its not shiny new out of a box). If you go to customs to register a camera these days they will laugh at you.