Good time to ask, with finished pens I have received swaps from the Uk , France, USA, Canada and many other countries without any incident ever. Rarely have they been opened by customs, however raw blanks have on occasion then cleared, the one terrible giveaway in timber is any evidence of insect or worm activity such as dross or a hole. My most recent purchase from China of many Manufactured pens from many sources in that country all arrived normally mostly through Hong Kong. The best thing is to name the parcel correctly for customs, eg Wood Pen etc. As they will be sent from the UK they qualify to family in Australia as true gifts.
Peter.