I think that first graph shows the price to ship a container ("blended" over several routes), not the cost of the container itself. "Drewry’s composite World Container Index".
Note that right at the moment the cost to move a container across the ocean is almost exactly the same as the cost to buy the container (see the second graph at the same url), for several routes. So it's easy to mix them up.
Note that right at the moment the cost to move a container across the ocean is almost exactly the same as the cost to buy the container (see the second graph at the same url), for several routes. So it's easy to mix them up.