If you go into a group in the admin console, select a device or several devices, on the "More" dropdown at the top of the page you can select Audit. The DRE support page suggests that you can then access the audit reports by going to the reports section of the management console but it isn't there.
I have raised a request with support who have told me the feature isn't available in DRE :( - where are my audit reports going??
It would be really good if this feature could be completed.