Dachlo - I've worked for supermarkets doing supply chain optimisation, I do have first hand experience of this.
I guess that it's best to just buy from the farmer's markets - then it's not a concern.
My boys own the markets we go to lol - they get so many freebies. Mind you it's a bit of a PITA that it's only open on saturdays.

Sloane, I don't know about the big markets in Melbourne but in Sydney we have the Flemington markets. They're open to industry on thursday and friday and the public (at higher prices) over the weekend. On the weekend the farmers are at one end and the other end is people who have bought from the farmers at the lower prices the day before so many of them are just selling the same stuff. They don't really have a clue what they're selling. The markets are stinky and crowded. My local greengrocer buys there on thursdays and fridays so I would rather buy from him for the same price as the public pay on saturday than bother with the market itself. I'd even pay more to avoid going there.

Have a look and try and find your local farmer's market. They're usually much less crowded and more pleasant. You can talk to the growers and ask them about their produce.