Maddie McCann's lunchbox.
also, why is he chevron joe?
I don't know where the alarm is a CTR?
it could be a tracker unit. I am fairly sure there is not a box like that under the seat on my facelift but then it could be different for the premier.
My money goes on being an aftermarket fit tracker as it looks like where the bolts look like they go (ie the corners) there looks to be a little bit of primer or similar.