It looks like this:

From either the Adobe System Status page or the email notification, you will see a long number that looks like this: 2019112503. This is the CSO number.
The CSO number contains the date of the CSO and the last two numbers refer to the order of CSOs that have occurred that day. For example, 2019112503 occurred on 11/25/2019 and was the third CSO to occur that day.
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