We pay Royalties on seed we use like that in UK, I expect you you have a similar system in Australia? With a task force to police the system?
We have some sheets of 9mm sterling cut to size to drop into boxes. Use them for storing odds and ends of grain.We use a denis d200, crank the wind up as high as she will go and it gives a pretty bold sample. Means you have to drill more kg but if the seed is tested clean we don't treat. Got a treater as well that we can use. Just treat enough as we go. Need to rig up some tatie boxes with solid sides and bottoms to we can dress the seed into them instead of bags, then just need to tipple into seed hopper.