The crazy thing is that our labeling laws are so lax. How can we as consumers tell of the origin of a product's content when it's labelled "Made from local and imported ingredients"? The berries could be from New Zealand, China, Chernobyl contaminated fields in Ukraine.... Who knows?
Here's a bit of a backgrounder from the ACCC: http://www.accc.gov.au/system/files/Country%20of%20origin%20and%20the%20Australian%20Consumer%20Law.pdf
Source description is really hard to do. Manufacturers don't put 'imported ingredients' on a packet to be misleading or disguise a country of origin. They print those words because it's the most accurate thing to do.
Many times with produce there is not a single source and if there is a single source today or this week, there likely is a different singular source or multiple sources the next day or next week. How many different boxes do you expect manufacturers to maintain printed and ready to go, just incase a source changes?
Then, you have to get the below minimum wage guys on the factory floor (who likely can't read english anyway) to determine that the produce going in matches the printed information on the packaging.
The Greens can enter all of the legislation they like, so long as their membership pays the full cost, not the rest of all consumers who truly only give a smeg about the bottom dollar.