It is very possible that he was registered after they docked. I just had a look on the Birth Death and Marriages web site for NSW, the registration for Agenor R Nichols is V1850611 35 and was registered in 1850. Some time after they had docked. You can check this by going to and perhaps even order the certificate,
www.bdm.gov.au This one listed as
Thomas Nichols b.1859, Goulburn, NSW d.1942 Granville, NSW son of John Nicholls and Ann Tew. Occupation: Railways. Brick Maker. Religion, Cof E. married 1882 Goulburn to Amelia Batten b.1864 Goulburn, daughter of Charles Batten and Amelia ?.
Children:
Edith Caroline b.20 Oct 1882, Goulburn. Married Young, NSW 1900 to Alfred Clifford.
William Thomas b.1884 Goulburn, d.1885 Murrumburruh, NSW
Ernest J b.1885 Murrumburruh, NSW (note: also says Kingsvale, NSW)
Albert Victor b.6 May 1888, d.3 Jan 1929 Newtown, NSW, married 1914 to Elizabeth M Spliet.
Charles John b. 13 Sept 1890
Ada b.1892 married Goulburn 1908 to William J Reardon
Edwin J b.1894 married Temora, NSW 1916 to Lillian M Ross
Horace Alfred b.1897 married Ryde NSW 1937 to Lucy M. Rimmer
Leslie N b.1901 Hay, NSW married Glenfell, NSW 1921 to Mary E. Downey
Percy J b.1903, Glenfell, NSW d.1904 Glenfell, NSW
This one listed as
Walter Nichols b.13 Jan 1856 Goulburn, NSW son of John Nicholls and Ann Tew. Occupation: Railway. Religion C of E. married Eliza Dengate Tickner b.1865 Camden, NSW. d.1931 Canterbury, NSW daughter of Henry Tickner and Martha Rideout. Religion, Presbyterian.
Children
Ethel Ann b.11 Feb 1887 Rocky Ponds, Goulburn NSW
Joseph Henry b.26 Feb 1888 Rocky Ponds, Goulburn NSW
Charles Walter b.26 May 1889 Rocky Ponds, Goulburn NSW
Alice Maud b.13 Dec 1891 Gaylong, NSW
Frederick W b.1897 Buriedrowa, NSW married Newton, NSW 1923 to Ethel P Richardson
Ida M b.1900 Hay, NSW married Sydney 1930 to Sidney R Wood.