Last shots -- really good fake or just a crappy run?
I notice a few differences between the two. First, the cut is different (the one actually on the camera has an inward curve at the lower left, the free strap is straight). Second, the stitching is different - the one on the camera is 'coarser' and closer to the center of the folded-over portion, while the free one has finer stitching that's closer to the free edge. Finally, the leather of the one on the camera has more obvious texture.
I got two of them from B&H about several months apart, and both are identical and match the one attached to the camera.
Unfortunately, I think it's probably a fake. If you didn't have two of them, you'd probably never notice... I suppose it's also possible that Canon changed the style of the strap slightly.