It's so hard to figure out what's service related or what's been swapped out and changed in 70 odd years of public ownership.
If its seen Australian service (coachwood is a strong sign it has) then you would expect to see the typical Aussie markings on the butt.
I would imagine among the ex Italian Navy examples, there must be some really good original sleepers.
Astonishing they kept them in store for so long really, the Italians clearly arn't fans of the spring clean!