People have been reporting their success (or lack thereof) in this thread...
http://forums.elderscrollsonline.com/en/discussion/180849/fragment-ratio-from-provisioning-discovery-thread#latest
Personally, I have completed 5 max level provisioning writs and have not received any.
Done about 15 and got one today. Do I need to keep it ans then use them when (if) I get 7?
Or can I just use it now?