For your info:
So no thieving scumbag can nick your rails and boxes. Givi have put a hole in the bracket that locks into the space beneath the side fairing. You can either use a padlock (So you will need 2! 1 on each side) or do what I have done and used a stainless steel bolt with a nylock nut. Ok if you are leaving the carriers on most of the time, and pretty easy to remove when needed.
Will stop the occasional thieving scumbag, but not the determined, but then nothing will.
You can if you want to use padlocks, get a duo set, with the same key for both.
I use a 43 top box, and 33 sides. The 43 will take my crash helmet - Shoei Multitec. It will not take two though but her indoors is rarely a passenger so no problems.
Just a thought - With padlocks fitted, they will probably rattle like buggery.........