Thanks to both Neill and Alan,
as the truck has recently been out of SACU we don't have that problem, I'm going to get a new carnet and change it over by taking the truck out of Nam either into Bots or Zam before the old one runs out. There won't be a "return trip" into Nam unless anything goes wrong, so there shouldn't be any difficult questions.
Interestingly enough, until relatively recently I didn't know that you don't have to get the carnet stamped between SACU countries - I presented ours at all border crossings and they stamped it with no questions asked.
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