How to gather bitlocker status?

Can anyone help me figure out how to gather bitlocker status for our laptops?

I found these, but have never set up a custom inventory before and support won't help me.

https://www-secure.symantec.com/connect/downloads/...

http://www.symantec.com/connect/articles/introduction-custom-inventory-notification-server-70

I set up a data class called Win32_EncryptableVolume with one attribute (string) called Encryption.  I took down the GUID of the class and created a task with the script from the link above, putting in my custom GUID.

No dice. 

Would appreciate if anyone can offer advice!