Jack
The 2 "buck in a porthole" badges were worn by many SA Troops, basically described as a general service pattern badge, I believe. There is a larger version in brass and white metal, that was worn as a cap badge by the 1st SA Brigade in France during WW1 and also in East Africa etc. Many different patterns cane be found, some even with crowns. Naming changes are that the earlier pattern is in Dutch and English and the later versions ie from the early 1920's is in Afrikaans and English, subtle differances in spelling. See here for a close up version of the buck badge:
http://www.britishbadgeforum.com/for...t=21443&page=3
As for the square badge I believe it is either a seal of some sort or it is a rifle sling number badge (slides onto the sling) almost like the old dog licence that used to be placed on their collars. Seen one similar before, it had been picked up at a battlefield site out here.
Hope this helps?
Brian