It doesn't happen often, but it does happen. That said, yeah, it doesn't increase odds of a robbery to give press tours.

http://www.datacenterknowledge.com/archives/2007/12/08/ocean...

http://www.datacenterknowledge.com/archives/2007/11/04/armed...

http://www.zdnet.co.uk/news/security-management/2006/11/02/l...

http://www.pcmag.com/article2/0,2817,2381108,00.asp

http://www.theregister.co.uk/2006/10/20/easynet_brick_lane_r...