Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)
The punt of money and time required to create the plastic case even if it's a one off test makes me believe it's real. The opening on topmost for the 3G antenna.
You could make these type of plastic cases overnight with the right machinery as prototypes.