Hi I found a document in this archive when I typed in the name. I saw in one of them. Try this link.
http://www.national.archsrch.gov.za/sm300cv/smws/sm200gi.
Then click on the RSA repository box, when it opens type in Penn Henry and enter. A list of documents will appear, just click on Result Summary and then click on each and you will see what info each one contains.Death appears to be around 1920 in the Cape.
The Genealogical Society of South Africa has a "pay to use" service which will enable you to obtain pictures of documents held in the National Archives.
Go to
http://www.eggsa.org and select Content --> On Line Shop --> order Archive documents. Once you have selected the currency, select "Enter the Shop" and then select "Archive photos" (in yellow on the blue band) and follow the instructions.
Much quicker than trying to get the Archives to reply to your e-mail requests!! Good luck Derek.