Malmgren, Carl - born 1880 Sweden - Can you find him??!

[Caz Coady]

Hej from Australia!  I am searching for information on my great grandfather, Carl Malmgren.  There are 2 scenarios:  his middle name was Oscar, he was born in or around Göteborg, parents were Oscar Malmgren and Anna Anderson, had at least one sibling, a sister, Anna who married and changed her surname to Magnusson, he was a ship's porter who travelled to Australia, married in 1904, had a daughter in 1905, disappeared in 1906 (maybe to San Francisco?) and nothing further heard;  
 
OR  
 
his middle name was August, born in Engelholm, travelled to Australia and used the name Carl Oscar Malmgren, left Australia in 1906 and settled in the USA.  Landsarkivet in Göteborg have no record at all of Carl Oscar Malmgren, nor does he appear on the CD Emigranten.  Was he trying to hide, maybe he has left a deliberately confusing trail.   Can you help, do you know of these men or of Anna Magnusson or their descendants?  ANY help hugely appreciated!  
 
Thanks, Caz.

[Ted Rosvall]

I have found three different Carl Oscar or Carl August Malmgren - do you have any idea WHEN your great grandfather was born?
 
TED ROSVALL