Had it been available, it would not even work, because the inside handle of the lens cap with normal fingers can not be operated. The fingers glide from to the extremely smooth surface, it lacks a little ribbing or a small edge. If one type of construction can not access the external buttons, has the cover is basically unusable.
However, the cover with me (Thanks stronger spring) holds better than the original cover of Nikon. This has clearly pronounced pushbuttons, who together with the lower spring tension already worried me that the lid has solved the transport in your pocket. At least something.