Security breach at super fund after Australia Post mail theft (2025)

A superannuation fund does not know how many members have been affected after mail was stolen from Australia Post in Melbourne's CBD.

In an email sent on Wednesday, Mercer Super, which also operates Virgin Money Super, said the breach affected members who posted mail to its Melbourne GPO Box Centre located at 380 Bourke Street between July 1 and 17.

Mercer Super said it did not know the exact number of members who had been impacted by the theft, but said customers who sent mail during that period should get in contact.

The superannuation fund has more than 1.1 million members, according to its website.

Security breach at super fund after Australia Post mail theft (1)

"If no information was posted to us in July, there's no need to take any action," it said in an email to members.

It told customers to be alert for suspicious emails, calls or messages, and to not share personal or financial information unless certain of the source.

The fund does not believe the incident has impacted members' accounts so far.

"Currently there is no indication that any members' personal information has been published externally or sold as a result of this incident," the Mercer Super website said.

The fund also said it had enhanced its security processes to further protect members, and has contacted the Australian Information Commissioner and the Australian Prudential Regulation Authority (APRA).

Investigation continues into post office box break-in

The offenders allegedly broke into the mezzanine area of the Melbourne GPO Box Room four times between July 6 and 17, an Australia Post spokesperson said.

"The offenders were able to force entry into a back-of-house area used for sorting mail and distributing letters into PO Boxes on three occasions, and on the fourth, left immediately when deterred by additional security measures," the spokesperson said.

"The offenders caused significant damage on entry into the facility, which was promptly repaired, and additional security measures were put in place after each break-in."

Security breach at super fund after Australia Post mail theft (2)

The spokesperson said letters were not tracked, unlike parcels, and Australia Post has been unable to identify individual mail or boxes targeted by the offenders.

Australia Post said it had increased security at Bourke St, including after-hours security in the Post Office Box Room.

"Plans are well underway for this facility to move to a new, nearby custom-designed facility next month," the spokesperson said.

Australia Post customers with PO boxes at 380 Bourke Street have been notified via letters to their boxes that their boxes will soon be moved 100 metres away to 385 Bourke Street.

Security breach at super fund after Australia Post mail theft (3)

No arrests have been made and Victoria Police says the investigation is ongoing.

Victoria Police have also confirmed two men broke in to Tynong Licensed Post Office, south-east of Melbourne, on July 16.

"Cash and parcels were stolen before the offenders left the area," a police spokesperson said.

Businesses urged to use registered post

A spokesperson for federal Minister for Communications Anika Wells said the Bourke Street Australia Post thefts were "concerning".

"Investigations are ongoing but Australia Post has taken immediate steps to reinforce site security, including repairs, enhanced locking mechanisms, and the deployment of a security guard during non-staffed hours," the spokesperson said.

"Australia Post has confirmed that no registered post items were taken.

"We are taking this matter seriously and encourage businesses to use registered post when sending items that require enhanced security, tracking and proof of delivery for customers."

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Security breach at super fund after Australia Post mail theft (2025)

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