I am making an assumption based on your question that this situation will fall outside of the legal requirements to keeping native fauna in QLD. The main question the Dept of Environment and Heritage will have is how you acquired the snakes. As Sdaji stated, there is not much chance of them letting you keep the animals when they have been acquired illegally. You may have the best of intentions or concerns for the welfare of the animals etc. But if acquired illegally, you have no right to keep the animals. The vast majority of reptile keepers in Australia abide by the rules, which are in place to protect wild populations and to protect the wider community, make sure that you do so as well. Otherwise you loose the privilege of keeping native fauna.
You will be tempted not not say anything and to keep the animals off licence, this is not the right option. Do the right thing now and you will not have to worry about getting caught in the future, getting fined, loosing your animals and being banned from holding a licence for a period.
My advise is to stay away from any situation not within the licencing guidelines, situations like this are not uncommon easily avoided.