Did you ever wonder why the cases here, in OZ and the UK are thicker than the US ones?

It’s because they can then fit the red tag security system

http://www.amaray.com/

We don’t use it here but perhaps Australia does.  The Americans of course had tags inside the case which can trigger alarms at the door. The red tag system can’t do that – it just makes it really hard to open the case if you steal it where as here of course, they remove the disc from the case (which I don’t particularly like)

Seems like a pretty reason from my point of view but I guess Australia is a bigger market and we have to get our stuff  from them