When is Due is due?

I bought two from Arduino with the help of my friend.
However, the board is different from the eagle file in official website. The eagle file is 4-layer pcb. The actual board is 2-layer.
I found many producers begins to copy the board. But it is easy to distinguish the real and the copy.
The attached pictures could show the difference.
The one on the box is the same with the eagle file
The real board are the one we receive.