The Guardian has investigated further: https://www.theguardian.com/australia-news/2025/apr/04/revea...

In the case of Norfolk Island, it was apparently some mislabeled shipments from Timberland (based in New Hampshire, NH <-> NI) and from two companies based in Norfolk, UK.

For Heard & McDonald Islands, it was mislabeled machinery that actually originated in Austria and Germany.