Brian Berg Asklev Hansen
Disclaimer: I havent received mine yet, so the following may be wrong....
Three maps (2 sheets backprinted)
I am assuming this is just an error on the box.
I think it´s because the maps in the box are in fact half a normal map that has been pre-cut in half as all the game maps on it are half-sized.
So the game in effect comes with 1 full and 1 half map (2 sheets), but in reality comes with 3 sheets of half maps.
EDIT: OMG I said "half" a lot in that post