The intention behind the unsolicited shipments has not yet been clearly clarified. Possible is so-called "brushing scam", the experts speculate. This is called fraudulent tricks that have the goal of falsely driving sales figures up or receiving user reviews. Seeds are suitable for this method because it is easy and cheap and can be sent as a letter.
I remember when NPR Planet Money did an episode on this some years back.
https://www.npr.org/transcripts/606517326
Was inexpensive trinkets out of China being sent to the US then. Doesn't have the invasive species aspect there.


Here's an example from the BBC:
https://www.youtube.com/watch?v=qeUM1WDoOGY
Though just to mix things up, the BBC Earth YouTube channel appears to be using title case capitalization in that title, which is typically an American English style, there. The main BBC YouTube channel appears to use the more-usually British English sentence case capitalization.
So I expect that there's always the possibility that people aren't always super-religious about the form of English that they use.