I just knew that when you import product to australia and it made from raw wood (eg MDF is not raw wood)than you need to provide the fumigation certificate to custom.
If you want more information just visit the below web site and email your question to them:
I booked a 20' container for all my stuffs, it's only took me additional hundred HK dollars for the wooden box for the piano. I also shipped a wood dining table set in the container and both passed thru customs without problem. Customs fee is a must, seems like no additional charges for the piano and the dining table set here in Perth.