I'm cancelling this one.
It's been a week since it was posted (Melbourne to Melbourne) and the tracking I was given was not a real tracking number and the proof of posting and real tracking number can not be found by the seller.
I had red flags when the seller wouldn't let me pay PayPal good and services, even after I offered to pay more to cover his fees, he said he needed paypal friends and family.
The seller has refunded me and ceased communication, other than 'pay me back when the cards arrive', which is strange I feel, because I've never had a seller, anywhere, ever refund me after they have legitimately posted something, they chase it up with auspost.
If by some miracle I am wrong and he did legitimately post the cards, I will not be opening the envelope and I will be returning to sender.