A five or ten dollar bill (depending on the amount of baggage one has) inside the passport works wonders for returning Filipino overseas workers arriving at Manila airport customs. Most of those are contract workers working in the middle east, and only go home every 2 or 3 years. And you know how we Filipinos are, we have to have a gift for everyone, can't leave anybody off the list!! The "gift" inside the passport for the customs officer ensures that no hassels or taxes will incur.