I ordered a silicone case from esmartphone on ebay and it definitely does not line up in the back. I'm sure it was a listing specifically for a Sprint Touch (CDMA). In fact, if you look at the pictures in the auction, you can tell the back won't line up correctly for the camera mirror and the speaker.
With that said, the case is pretty good for the money and the speaker misalignment does not really affect the sound output. I'm good for now.
Just a heads up for ebay silicone cases.