In Namibia, all casinos still use plaques. Windhoek Country Club (Desert Jewel Casinos) even introduced new ones recently.

The plaques from South Africa I got recently. I was told they are all valid and in use. Some casinos apparently discontinued smaller plaques (e.g. 100 Rand, some also discontinued 500 Rand plaques).

Here are some more pictures of different plaques from South Africa and Namibia: