theres all kinds of things you could do, some people will happily write what you ask them to write on the package but at the end of the day if the full amount isnt stated then it isnt insured
that said my turtle came thru customs (although delayed by a week) without charge at all and was marked as 'prototype paintball parts' but then again it was a body and parts, NOT a complete marker.....remember that whatever you ship is gonna get xrayed and they aint stoopid
one peice of advise tho is make sure that the word GUN is not mentioned at all!