Australia Post in online privacy breach

This article was about Australia Post releasing the names and locations of thousands of Australians who have been sent parcels.  This was blamed on a computer glitch, but you never know with all the hactivist groups out there.  The Australia Post was forced to shut down its online parcel tracking system, after a customer announced the privacy and security breach.  It came about as simple as typing and searching for a random number, and thousands of Australians information was released.  A spokesperson was sorry about shutting down the system, but not about the privacy breach.  So was this just a glitch in the computer system? Or was it a hacker? I personally do not know how a glitch in the system could release so much information, but who knows.  This could have released a lot of information including: names, addresses, emails, and even potentially financial information, as this was through the online parcel system.  It just goes to show that even sites that you can believe to be safe and trustworthy can turn on you.  You must always be aware of the sites you are using and use extreme precautions, as you never know who may be trying to search you.  The article is:  http://www.news.com.au/business/companies/australia-post-in-online-privacy-breach/story-fnda1bsz-1226498834454