See comments §A.5.a. "BORG CLass 4 level" is a high or highest level of protection for breaking &entering and burglar alarm installation in Netherlands (tvds 20090205). See http://www.hetccv.nl . That rating covers access up to the hosting room. Basic story confirmed by onsite visits, 200701xx, 200703xx, 20081001. Need to know what the protection / regime over the keys is. This is for §A.5.e. It would be interesting to know what the story with cameras is.