You're very welcome. I thought of one more resource this morning. The place where I've seen the most early African hunting books is AntiquarianAuctions.com. Antiquarian Auctions is a platform, but all the sellers are book dealers. They alternate between "US auctions" and "South Africa Auctions". You can browse past "SA Auctions" and choose "Hunting & Shooting" to see realized prices.

For example, you can see the Hunting & Shooting results for the last SA auction here:
Hunting & Shooting - SA Auction #89 Results

They also have a search feature, which turns up about 20 past sales of Samuel Baker books, but no copies of Wild Beasts.