Those bolts work for the honest thief. A flat head screwdriver will take care of that pin in one second flat. I have those type of locks on some of my network cabinets. If you forget the "special" allen wrench, one little twist with a screwdriver and you're in.
But like I said, most crooks wouldn't know to do that and would move on to an easier target. I have yet to get some speakers, but when I do, they will be removable until I get a garage this damn boat will fit in!