Thank you for the census details.
The George SMITH who arrrived on the Neva was sent to work for Joseph ONUS at Richmond in 1834. Joseph ONUS died in 1835. His wife, Ann ONUS advertised for companion in 1835 - her address is "Clearoak Farm, Richmond". Ann married William SHARP in 1837.
(There was a land dispute between Ann SHARP, previusly Mrs ONUS in 1837
eg
https://trove.nla.gov.au/newspaper/article/2212749 )
I wonder if George SMITH remained at the property in Richmond after Joseph's death, or Ann's remarriage, it's very difficult to know. His Certificate of Freedom has "Windsor" written on the side, so sounds like he was still in the area in 1840. Unfortunately for trying to track him, he was then "free" to go anywhere.