...Premium tagged bags were the very last to appear on the belt in BNK...
I have been watching their baggage loading patterns on the tarmac in SYDney over the last few months of flying. And even when it's raining, they are consistently putting the premium tagged bags on last (so they should be first off, in theory, at the other end).
When all the baggage comes out to the tarmac on trolleys to get loaded, the premium tagged bags (and yellow/black tagged transfer bags) are all placed on a separate trolley or one side of a trolley, making it easier for the baggage handler. But I have noticed the baggage handlers do actively check the trolleys and appear to make an effort to also ensure they don't put any premium tagged bags on until last.
If a trolley has both premium and non-premium tagged bags on it, and there is a second trolley of non-premium tagged bags still to go, they stop half way through the first trolley (once all non-premium tags are loaded) and move it aside, while they clear the second trolley, then come back to the first trolley and load the premium tagged bags last. (AND, if it is raining, they don't even use that as an excuse to "just get everything on quickly, regardless of order" - they will pull a tarp over the premium bags to keep the rain off, ensuring they still go in last and aren't left in the rain while they wait on the tarmac.)
As an aside, after arriving in Melbourne the other day, all the premium bags came out first in one burst, with quite a wait before a second burst with the rest of the bags. So, they may be using a dual delivery system there now!? Where once the trolley full of premium bags is offloaded from the plane, it is immediately transferred to the baggage carousel, rather than wait for all the bags to be off-loaded before transfer in one go. It was slick, and I hope they continue it as a process, as most of the premium passengers were disappearing off with their bags as the other passengers were still arriving around the carousel, which helped reduce congestion for everyone! (Even though they have 3 carousels up and running in Melbourne now, it is still a cramped little area.)
Years ago Qantas use to do this at various ports, and it was fantastic, particularly SYDney, where by the time you walked to the baggage carousel, your bags were coming out at the same time.