Unfortunately, there aren't many good reference photos of Australian Pokemon Sapphire cartridges around, so it's impossible to be certain if those are legit copies or not. Based on what little I've seen, I'd lean towards them being real rather than fake, but as always, use your best judgement whenever buying something like this online, and like Astinus said, make sure to do some research on the seller to be sure they're reputable. Maybe even request a few extra pictures of the carts just to be sure- if the seller has legitimite copies, they should have no problem taking them for you if you're interested.