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I got stung by Fedex fees after the fact when I lived in Japan and shipped all my snowboarding gear over. They set a Japanese law firm * on me to collect the debt. Which quite obviously shit me right up as I had only just moved to the country! Needless to say I paid, immediately.
(*) It was also most embarrassing having to take the letter to my Japanese teacher at the time to get help translating it.
sometimes you can get lucky and its delivered by fedex and you get an 'invoice' a few weeks after delivery which you obviously swiftly ignore