Apparently a new possum box screwed to a stem of a big multi-stemmed Acacia floribunda tree and empty; see my sighting with comments and questions
https://canberra.naturemapr.org/sightings/4507001
This possum box might be in conjunction with a recent release.
Ranger and I probed a second time whether a possum resides in the box and it seemed empty. I wonder whether released possums are either killed or find a way back into suburbia.