Just two more things:
A) no one has specified which authorities, the only one named to date is the land manager. Police may decline to get involved, particularly due to lack of evidence (because it's literally one person's word that he did it).
B) no outcome has been recorded, it's most likely (because this is Canberra) that he'll get a talking to and the old not to do it again. That won't end in anything more than a fine which won't harm his legal standing as it's not a conviction, and I doubt Parks would even bother as, once again, there's no evidence beyond photos showing he was there.