You copped a double whammy. Both Sunshine West and Chullora. Both notoriously slow and it's not unheard of for items to ping pong between the 2 of them several times before reaching their final destination. My guess is it should arrive in the next day or 2. There were quite a few down days between Christmas and now, which eBay don't take into consideration when planting the estimates in listings. As far as eBay is concerned, every day is a business day.
As far as I know, the two tier system is only for letters, not parcels.