The parcel has arrived in Vanuatu. After leaving Melbourne, it went via Sydney to Port Vila. Hooray!
We find the regular postal service more reliable that couriers. In Vanuatu, couriers don't deliver to the door. The parcels are signed off upon arriving at the courier's office and then they contact you to let you know there is a parcel for you. This may take some time, and often we hear via word of mouth that there is a parcel somewhere for someone (at least the internet makes it easier to track them). Some companies only have offices in the capital and they send it via regular services to the destination island anyway.
Unfortunately, most businesses won't take our word for it and continue to send things via courier.