I remember working for Far East Bank during that time of the said faking of banknotes with same serial numbers for vote buying. We had a conference in Central Bank about it because it came out on the opposition newspaper during that time. This was when Photoshop was not available and the way they changed the numbers was for banknotes with consecutive numbers, picking the last number with a needle to alter the number, e.i. 3 to make it 5, etc.