mattwnz: This sort of thing is why I think country of origin labelling should be madatory. That way we are able to easily tell where our food has come from. We have really strong food handling rules in NZ which adds significantly to the cost of production in NZ. Whereas I don't believe there is any way of checking if imported food meets those production standards.
Not sure where these frozen ones are grown in this case, so wonder if they are NZ grown?
If you look at a number of brands of frozen berries they're pretty big on COO labelling - but clearly it's pretty hard when you're importing product from so many countries to ensure year round supply.
This also isn't just an issue with imported products. Scares have also occurred in the past with NZ berries (both fresh and frozen).