When I was a younger fella, I was in the Australian Navy...11 years, mostly on Frigates, and we would visit SE Asian ports 3-4 times a year on exercises. I thought I would share a little of my experiance in dealing with some of the best sleight of hand master in the world.
OK. Imagine you want to change some money, and it equals for the sake of ease, 10 paper notes, the money changer will count out in his hand the notes and then FOLD the notes in half. This will give 20 CORNERS to count. With me so far? But in fact he will have only 9 notes...all facing the same way, and the correct way up. The 9th note he will face in the opposite way, so that when all the notes are folded, 10 corners will appear to be facing the same direction. And when he puts the folded notes on the counter to count from the corners, theatricaly and slowly counting the 10 correctly facing corners. Badda-Bing. Your done! They will somtimes put a few rubber bands around the money, saying it will stop you losing any, and stop you from immediately recounting.
The other way is simmilar, 8 notes will be laid flat lenghtways, and one note folded 90 degrees to them, holding the notes together....still only 9 notes....but 10 NOTE EDGES. A good one that.
Hope this helps. Remember at the casino, how the croupier will lay all the notes flat on the table and in a straight line? Make sure the money changer does this, and then YOU bundle the money up.
Good luck!