There's a small population right now around Rhodes. There are nearly always some Zebras around Richmond Lowlands, but you need to find them. The best and closest reliable place is the Capertee Valley. Especially around the north area of Glen Davis. Attached is a map of Zebra Finch sightings around Sydney.
Edit: Also, in western Sydney the best place to see them is a little road that's near Bushell's Lagoon. That's where I see them the most. If you want PM me and I'll give you more details and how to get there!
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