Hi have you Googled "Robert Berry" Dungong, there are bits of information that come up.
Also on Anc..try there is a tree which indicates that Robert Berry B:Jan 1843 in Lincolnshire, Nottinghamshire, United Kingdom D:21 Nov 1912 in Dungog NSW Australia
immigrated 26 Jun 1844 Vessel Name:Briton with parents Robert and Mary and siblings James , William and Elizabeth.
Cass
also on Trove, Richmond River Herald 26 Nov 1912, there is a snippet regarding the death of Mr S Berry of Thalaha, (Thalaba) could be him