Just as an update, I too ordered one of the Orange shells for my AT&T Lumia 830. Unfortunately, there are problems:
1) If I use this shell with my DT-900 wireless charger, it omits a high-pitched hum. The connection-coverage area seems to be smaller than the AT&T supplied shells.
2) The Orange shell does NOT work at all with my CR-200 Wireless Car holder. I assume this is due to a variation in the placement of the connection of the shell to the back of the device.
So, it looks fantastic, but may not be all that practical, depending on your needs. I had to go back to rocking the AT&T supplied green shell.
Like I said: If I use the green or black AT&T supplied shells, my CR-200 works 100% of the time. I've never had it fail. And I used it yesterday. Sorry, man. Doesn't sound like Microsoft's problem.
Remember: The AT&T shells are wired for BOTH the Qi and PMA wireless chagrining standard. They are technically different. The non-AT&T shells are only Qi charging capable. So in your situation, if you use the shell's that came with your 830, they should work OK with the CR-200. They will line-up properly with the charger and your phone.
Or at least that's what I would assume from my experience.
So, are these charging plates only available from non-official resellers? No official MS/ Nokia outlets to order these accessories?