Rebates - you can search for placements that have had a rebate applied, helping you identify where there might be issues in your recruitment.
Other - here you can search for placements that are still within their rebate period, this is vulnerable money that you may wish to watch closely. Searching for placements outside of their Grace Period (Grace Periods are a way of superseding the rebate period with a longer protection period for applicants placed into Fixed Fee placements) will give you a pool of applicants that you could approach to place again. Additionally, you can find all interval charge placements that have ever had an extension.
With all the above search criteria you can run these to either include, ignore or exclude the criteria (the later is called Reverse searching), please see the Searching Introduction article for more information.