How to Determine the BitLocker Encryption State of a Lost Computers
Microsoft BitLocker Administration and Monitoring (MBAM) enables you to determine the last known BitLocker encryption status of computers that are lost or stolen. Use the following procedure to determine whether the volumes have been encrypted on computers that are no longer in your possession.
Determine a Computer's Last Known BitLocker Encryption state
Open the MBAM website.
The default address for the MBAM website is http://<computername>. Use the fully qualified server name for faster browsing results.
Select the Report node from the navigation pane, and then select the Computer Compliance Report.
Use the filter fields in the right-side pane to narrow the search results, and then click Search. Results will be shown below your search query.
Take the appropriate action as determined by your policy for lost devices.
Device compliance is determined by the deployed BitLocker policies. You should verify these deployed policies when you are trying to determine the BitLocker encryption state of a device.