It happens--just not too often. One time a few years ago someone gave me some ones which came from some kind of fundraiser accumulation. One of the ones was a poor quality fake of the typical inkjet printer variety. At first glance it looked okay but I could tell it was off, and it was.
I think they counterfeited an image posted on forums maybe, because I never seen round edges like this unless it's been cut again. Why anyone would cut round edges on a real dollar bill would make me wonder... lol and why are the edges on the ink bleeding under federal reserve note. Lol cuts man. Look at them cuts hahahaha I got passed them cuts in grade school hahahaha
I used to have a couple soda machines. It surprised me what the dollar changer would and would not take. There was a fake one in the buch and I could have spotted it a mile away. Probably only fake I got the whole time I had them.