Very possible there are some Puku in Zambian collections. Munda Wanga near Lusaka had Puku according to Bradt's travel guide. I spent a week in Zambia before South Africa but didn't have time to visit any of their zoos. I focused my time at Kafue and South Luangwa National Parks. Saw tons of Puku in the wild as well as a Sharpe's Grysbok and some Lichtenstein's hartebeest.
