It's quite unusual for offices to get broken into during the daytime, but it's a different story at night after everyone has gone home. Offices contain a lot of valuable items like portable tech and company car keys, even petty cash boxes.
Insurance will replace any stolen goods, eventually, but there are some items that cannot be replaced. Your staff's personal effects for one. And let's not forget 'data' - one of the biggest commodities nowadays.
Data loss can bring it's own unpleasant legal side-effects as well.
The fog produced by our Smoke Screens (link to S70) is so fine that it doesn't leave deposits, marks or moisture when it settles. This means it won't damage or short electronic goods like laptops or banks of raw computers running your server room.