@Amir kweli kweli, pole.
I remember many years ago withdrawing money from an SCB ATM and giving KShs 1,000 to a friend who said he had problems of the same kind.
But more recently was outside an ATM withdrawing 2,500 but punched an extra 0 by mistake, much to my chagrin! I had to immediately go into the bank to queue to deposit the excess funds.
At the counter, I was surprised by how many times the teller scanned and rescanned 1000s and 500s, while occasionally looking up to see whether my face gave any clue of suspicion. I just stared quietly with wonder, choosing not to share the fact that the ATM had just dispensed those very same notes.