I've had my Rosella box out for years with no usage so I moved it a few weeks ago. I noticed this morning it had fallen down, and peered in to find what I think are possum droppings. The front of the box was scratched with a bit of golden fur caught in the rough wood. Not my target inhabitant but better than nothing so I cleaned the box and reinstalled it, now better secured so should be able to handle a possum's weight
We had "official" size possum and crimson rosella boxes very close together in our garden, but found the possums often preferred the much smaller rosella box, which was a very tight squeeze for them indeed...