This can also be done via MCX.
com.apple.SetupAssistant
DidSeeCloudSetup setupassistant (Computer Group) once 1
LastSeenCloudProductVersion setupassistant (Computer Group) once 10.8
Or another view:
# dscl /Search mcxread /ComputerGroups/setupassistant
App domain: com.apple.SetupAssistant
Key: DidSeeCloudSetup
State: once
Value: 1
App domain: com.apple.SetupAssistant
Key: LastSeenCloudProductVersion
State: once
Value: 10.8
The value for "DidSeeCloudSetup" should be a boolean (True) and the value for "LastSeenCloudProductVersion" should be a string.
You could probably also manage these "Often" or "Always" and get similar results.