In November 2014, the postal service disclosed that they had suffered a data breach affecting 800,000 employees and 2.9 million customers.
The service discovered the breach in mid-September but didn’t publicly announce it until early November. Unfortunately for the individuals affected, personally identifiable information ("PII") was compromised including birth dates, Social Security numbers and addresses.
The service disclosed that the FBI was investigating the breach and hasn't yet officially named a suspect though back in 2014 many media outlets were reporting that China's government hacking groups were the prime suspects in the investigation.
In mid-July 2015, significant costs were revealed related to remediating this incident.
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