On the National Archives of Australia website
http://www.naa.gov.au/the_collection/recordsearch.htmlthere are records for 2 Boussers
Title
Bousser, Edna [also known as Edna Brown] (Australian) [Box 454]
Series number
C123 Control symbol
14844 Contents date range
1941 - 1941
Access status
Not yet examined Location
Sydney Barcode
9396211
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Title
BOUSSER HENRY ALPHONSE : Service Number - NX23432 : Date of birth - 16 Mar 1905 : Place of birth - NORFOLK ISLAND : Place of enlistment - PADDINGTON NSW : Next of Kin - BROWN EDNA
Series number
B883 Control symbol
NX23432 Contents date range
1939 - 1948
Access status
Not yet examined Location
Canberra Barcode
4658273
According to this , Henri was born on Norfolk Island not Isle of Pines, in 1905, not 1899
You can obtain a copy of the record from them