[Yankeeman07]

And how are people who do not use Centrex supposed to do this when nothing is disclosed on impacted parties?

Read Centrex Post:

How did Centrex respond?
We engaged legal counsel and cyber forensics quickly upon discovery in accordance with our policies. We preserved all available logs for analysis, as well as requesting logs from our third-party providers.

What information was involved?
Our investigation into the incident remains ongoing. Once the investigation is complete, and if our review determines any customer or personal information is involved, we will notify the appropriate parties in accordance with our legal obligations and state and Federal law. We understand the importance of this information and will ensure that this process is carried out as quickly and efficiently as possible.