Not sure if you have these but may give some clues as to places and dates. They may or may not be your persons, and they don't add much more information.
NLA's digitised newspapers have the following:
South Australian Advocate October 1858
Insolvency of Charles Thomas and Mauris Thomas, the younger, of Callington, millers, trading as C & M Thomas.
SMH Sept 1874
'Mr Mauris THOMAS writing from the mine of Southern Cobar Copper Company....'
Brisbane Courier 16 Nov 1874
Forfeiture of lands. The following lands have been declared forfeited:....2560 acres acres leased by Mauris Thomas
and 250 acres by William in the district of Clermont
The Argus (Melbourne) May 1857
Applications for licencing: Thomas, Mauris, City Hotel, Madeline St
SMH 2 January 1890
Death Notice: THOMAS, at his residence Cudal, Mauris Thomas aged 59 years. (Could just be 39 but 59 looks more like it) I guess this is the younger one that you already have.
The Argus 1859
Patent application for washing powder Mr Mauris THOMS of Collingwood.
The Argus 1868 and other dates
Mauris Thomas, manager Burwood Wharf Newcastle
There may be more................... I searched using Mauris+thomas
http://newspapers.nla.gov.au/ndp/del/homeJudith