If you already had 2 360 (updated V6 boxes) and one is being replaced due to a fault then it looks like the wrong box has been linked to being replaced.
It is a V6 Tivo box that was upgraded to 360. The new box in the living room is 360 box. Both look like the one on the left.
Why have you received a new box, usually if you are going multi room and adding a box you would be sent a mini box not a 360 main box with hard drive, it sounds like when you activated the new box the old box has been deactivated and this would need a call to Virgin to get resolved or you can wait 2 to 3 days for one of the forum team to respond.
It's very possible whoever set this up at Virgin has done something wrong.
Hello again,
If you have the TVGO app you can check which boxes are on your account and the serial numbers, when you sign into the app go to Settings, Virgin TV boxes and you will see the boxes.
