Any ideas on what this could be about?

The packages are now turning up in Australia and TT reports that it's been going on for years.

Didn't think too much of it but read today that former legislative assistant Chen Wei-jen (陳惟仁) from Taiwan has been arrested in connection with the sending of suspicious packages.

The TT reported that "On Aug. 13 Chen and two other former legislative assistants were indicted for contravening the National Security Act (國家安全法) for allegedly collecting classified materials and meeting minutes from the Legislative Yuan, the Ministry of Foreign Affairs and the Mainland Affairs Council, and passing on lists of government personnel and reporters to Chinese intelligence officials."

So if someone who is involved in spying for the PRC is also involved with the sending of seed packages around the world then it raises some alarms as to what could be the motive.