They were witchetty grub moths that have emerged from holes in trees where they pupate, and are only a problem for the trees the grubs burrow through. We found a discarded pupae case on the ground in Foxes Lair today.
Many years ago our family camped overnight at Mundrabilla and the public toilets were full of these moths.
The kids loved them. My son Andrew adopted one as a pet and it spent the night in his tent. Unfortunately when he took the moth outside the next day, it slowly flew upwards before being snapped up by a crow that retreated from an onslaught of stones hurled by one enraged boy.