The 1st reference to a Carl Klibbe in Cape Town archive (KAB) is about a mortage bonds in 1890,1891, 1894 and 1897 and the last reference in these archives is:
Depot:KAB
Source:MOIB
Volume:2/3198
Reference:460
Description: KLIBBE, CARL George. Insolvent liquidation and Distribution
Date: 1908-1909.
In the Transvaal archive (TAB) there are 6,of which these are most relevant I think
Depot: TAB
Source:WLD
Volume:0
Reference:32/1929
Desc: Ex Parte application. Estate Carl George Klibbe
Date:1929
Depot:TAB, Source:MHG, Reference: 75319, Desc: Klibbe, Carl George
Date:1931
Remarks: Predeceased spouse Christina Klibbe