Perhaps you have the following from
BISA. This is an excellent resource but is far from 100% accurate as there are many omissions and errors.
The only Thomas I can find is this one arriving in 1848.
MESSENGER Thomas arrived in SA 23 Mar 1848 aboard
DAVID MALCOLM from London
http://www.slsa.sa.gov.au/fh/passengerlists/1848DavidMalcolm.htmMESSENGER Thomas born 11 Aug 1831 ENG and died 22 Feb 1910 Alberton SA and is buried at Cheltenham Cemetery.
Arrived 1839
Occupation Dair Farmer
Lived Kilkenny, Two Wells, Findon and Alberton.
Religion Church of England
Married 1 Mar 1851 Adelaide SA Amy nee MILLS Parents William and Sylvester Nee FLOATE[E] born 7 Dec 1834 Ashford KEN ENG who died 22 Apr 1912 Adelaide SA
Children Thomas died as infant, William 185?-, George 1855-WA, John 1858-, Jesse 1860-, Matilda STOCK 1862-1891, Alice SHAW 1864-19?, Ada Eva FRASER 18?-Vic, twin, Eva Ada SANDFEED 18?-WA, twin, Bristow Albert 1869-1947, Emily Edith TRIGG 1872-, Amy BRADLEY 187?-, Alfred.
You will need to search for a parish baptism or locate him on the 1841 census.
Cando