You need to contact the seller about it but a week should be long enough over that distance

Do you mean delivery time? As in it was posted a week ago and took a week to arrive, or it's been a week and hasn't arrived yet?

I tend to give two weeks (or 10 business days) before I query an item that hasn't arrived, just to allow for any Australia Post delays. Most parcels within Australia do tend to arrive within that time and for me (Adelaide), it's rare for anything to take longer than a week, but it can and does happen for longer or remote distances. 

If you are concerned, the best thing to do is contact the seller so that they are aware of everthing, and can follow up on it in case something has gone wrong. If you have a tracking number for the item, you can enter it here: http://auspost.com.au/track/ to see if there are any events recorded for the parcel - just remember the time it takes to be delivered after posting is beyond the seller's control. 

I think so I am thinking of bidding just to see how australia post goes with not spilling the included coke and I hope its cold as in the discription. Would hate to have to open a not as described case

couldn't help myself have placed a bid

• with the postage times, you must always also take into consideration what the Seller has quoted as 'handling time' under the Postage Tab of the listing.  Some sellers can only post once a week or require a 3 or 4 day handling time, so that has to be remembered when thinking that your item should have arrived.