AH also have free plastic coins they are happy to give away, kinda defeats the purpose for which the coin system was introduced
But one or 2 coins is never an issue, I still carry around a 50c coin even though all public toilets now charge 70c and accepts an NFC debit card, as well as the metallic AH coin and it was never an issue, the only issue is when I travel with a wallet full of Rand coins, unclear what's the threshold.