Moved to Encryption: ePO Managed for better support.
Drive Encryption is is still active on the system:
2015-07-22 15:24:18,907 INFO PcSystem Starting (BIOS, activated)
You will need to first decrypt and deactivate the machine. Assign a policy to the machine in which the "Enable Policy" check box in the Product Settings policy is not selected. Once the decryption process is complete, the machine will deactivate and the product can be removed.