All the bad looking and mutilated naira notes that rejected in the Southern part of Nigeria, are used for business transactions in the North. You will be given mutilated naira notes as change in the North and you will also use the same money to buy something.
People don’t reject mutilated money in the North. You can also walk into any bank with your mutilated naira notes in the North and it will be changed for new naira notes. #10 and #5 are still in abundance in the North. While in the South, you hardly see #10. In Benin, PH and Delta people no longer use #5 for any business transaction. However, in the North, no one reject #5.