Hi Jeffery,
Sorry for the lateness of my post, and you've probably work out all your answers by now, but I just wanted to remind readers of something often forgotten when it comes to importing.
Customs is one thing, but you really have to keep quarantine in mind too. If a saya or any other attachment to the sword is made from an endangered or protected spieces, the item will be confiscated and distroyed. No ifs, no buts.
If for example it is wrapped in shark-skin, you will need to make sure that its not great white, or grey nurse or any of the other protected spieces. Australian Quarantine are especially strict on this.
If in doubt, always try to have the sword inspected prior to import, or have the sword mounted in fresh mounts.
Hope this helps everyone.
Cheers Warrick