Hi Sam

Welcome to rootschat

I can't find a birth on the date you mention for Archibald Leslie
COOPER, however this looks like his birth in 1896.
COOPER Archie Leslie
Father George Mother Louisa WILKINS
5 Feb 1896
At Glanmorgan Reg#940/1896
His parents' marriage
COOPERGeorge Alexander 24 years
WILKINS Louisa 20 years
7 Feb 1881
At Fingal Reg#25/1881
and his siblings
COOPER Charles born 5 Apr 1881 at Fingal Reg# 692/1881
COOPEREda Rosina born 9 Sep 1882 At Fingal Reg#1284/1881
COOPER George born 26 Sep 1886 at Glamorgan Reg#1695/1886
COOPER Hilmer born 8 Aug 1888 at Glamorgan Reg#1882/1888
COOPER Clara Maria born 11 Jul 1891 At Glamorgan Reg#1804/1891
COOPER William John born 23 Jun 1893 At Glamorgan Reg#1033/1893
According to his age at time of marriage, George was born c1857
There is this birth, but no way of knowing if it is you man.
COOPERGeorge
Father Joseph Mother Matilda KEMP
9 Jan 1856
At Sorell Reg#1472/1856
This is likely Louisa's birth
WILKINS Louisa
Father William Mother Hannah RUSSEL
4 Nov 1860
At Glamorgan Reg#1205/1860
his first wife was mavis mcintyre craig
This does not appear to be correct. The births of two children also have the father
Arthur Leslie
COOPER.
Marriage
COOPER Arthur Leslie
CRAIG Mavis McIntyre
2 Nov 1916
At Zeehan 1916 Reg#18434
On the 1919 Electoral Roll there is a Archibald Leslie
COOPER and Mavis McIntyre
COOPER living at Linda, Tasmania. His occupation is labourer.
Records are not available after 1930 in Tasmania.
Is this the death of your Mavis McIntyre CRAIG?
COOPERGiven Names: Mavis
Father Craig Wm Jno Mother Amelia DEBRO
At Prahran 36 years 1934 Reg#6458
Marriage in Victoria
COOPER Archibald Leslie
EAMES Lillian May
1935 Reg#10706
and Lilian's death
COOPER Lillian May
Father Eames Richd Henry Mother Lillian May THOMAS
At Preston 31 years 1945 Reg#6052
Lillian is buried at Preston Cemetery
http://www.prestoncemetery.org/old/search/COOPER Lillian May
Section H #06184
28 Jun 1945 31 years.
Cheers
Cando