I think you're correct, Mancha. One of a handful of packs from the "Return to Darkest Africa" range that were inexplicably withdrawn from sale (a couple of packs of Zanzibari regulars also got the chop, can't remember if there was anything else).
I too, neglected to buy any at the time (though I managed to get the ones with the other hats, that didn't go out of production: Typical, eh?). Don't beat yourself up about it, Mancha. How were we to know they were going to do a disappearing act?