Alert for Formatted Devices
Sophos to include a way to alert Administrators to PCs formatted [MAC andress] devices so that we know when and where a device has been formatted and whether or not Sophos has been reinstalled if it has the MAC information with the discovery of Sophos network.
Stephen Higgins commented
There are multiple solutions for finding machines on your network that are domain joined that don't have SAV installed. KBA3090 here https://community.sophos.com/kb/en-us/13090 will protect any non-protected formatted devices.