Probably he uses his Retail 3DS to test stuff, too.It would be helpful to see a picture of the volume bar, because all SDK 3ds' has a blue volume bar to tell it's a SDK one. Other than that it looks like a regular 3ds (with streetpass on by the way, which is impossible with a SDK 3ds as it can't communicate with retail ones, same with spotpass)
For sure he won't take photos/videos of his Devunit.