Holding happens every time when an item is over $15, at least in my country. Then I tell them to get the package from the customs and they deliver it to me (although not quite, if it get's hold I have to go and pick it up myself) and pay a transportation fee. It happens only if I order outside the continent, otherwise doesn't.
When an item gets hold they should have called you and inform you about the ways to get it. But no, they will not seize it.