how to find removed work item link from a change set?

One of our (experienced) user had delivered a change set to RTC which wasn't supposed to be delivered. Right now the change set has no work item associated.

We have the following set in our PA:
- Restrict Associating to Closed Work Items (Precondition: Deliver (server) )
- Checking if a Change set is associated with at least 1 work item which are not "Resolved" (Precondition: Save Change set Links and Comments (server))

These settings should have prevented the Change set to have at least 1 work item linked but not.

My guess is that the Work item association would have been removed from the Change set when the work item is in status "In progress".

Here are my questions:
 - Will RTC allow this removing of Work items with the above mentioned settings activated?
- Are there any ways to find out if a "Change set" was ever linked to a work item and the work item details?

Thanks.