The lack of airiel is why is not working, no signal pickup.
Look for sign of cut black wire at opposite end of box to plug.
Remotes came with car x 2
Take the box to a key cutter/ key programmer and go from there, if he can scan the box he may be able to program a remote to suite.
Seems it's a similar system to a TV antenna, the better/ closer it is to outside of car the easier the button control picks it up and more effecient the signal is sent with less obstruction of the fairly poor signal to begin with.
The closer the signal/antenna wire is to the bottom of the windscreen the closer it is to giving an uninterrupted signal to remote that's outside the car.
I just layed mine on top of the black plastic vent tubing that leads to the vent nearest passengers door. Can't see it working any better than that position.