After getting the matte Touchstone battery door, the standard glossy cover was just sitting in my desk drawer collecting dust. Then came a tweet from @spckeishou (Mark), whom suggested getting the glossy back engraved for free at the Sprint Studio that he works at. And after a few days, my glossy battery door was off to the studio for engraving!
[Thank you, Mark!]
The engraving on Video (Taken with a Sprint Touch Pro):
Check out the full engraved Pre Gallery: