Vgchartz is obviously not going to be spot on when it comes to really tiny figures like that. I believe one Vgchartz user (leo-j?) said that he went out and bought a few Xbox 1 games brand new to see if he could be singlehandedly responsible for most Xbox 1 sales for the week. Well it turned out that he bought more Xbox games than vgchartz reported. lol. Obviously vgchartz isn't going to get the numbers down to the exact number.