I don’t think it is an olive python. I was fooled by the colour and lack of distinct pattern. No olives have been reported in this area. Their range is much further north. The only python reported on Bribie is the carpet python, Morelia spilota. That was my first guess, but I found no pictures of juveniles of a plain olive colour. So I guessed again. Probably wrong.
I need an expert to ID it.