The case appeared to be made of gravel. It looks similar to https://canberra.naturemapr.org/Community/Sighting/3388158 and also https://canberra.naturemapr.org/Community/Sighting/3344866.
This is easier to identify as the head and prothorax are visible. If the internal animal is not visible, it is hard to even tell the Order, and distinguish a Lepidopteran from a Neuropteran.