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the OIG searched the FBI's database of Confidential Human Sources (CHS), and did not find any records indicating that Mifsud was an FBI CHS, or that Mifsud's discussions with Papadopoulos were part of an FBI operation.
Likely Mifsud worked for the Pentagon, like Stefan Halper. For sure Mifsud worked for MI6
I doubt the IG had access to corroborative sources to properly place Mifsud. I have said since the release of the Mueller Report that Mifsud had to disappear soon after the election and the Devin Nunes investigation because he was proof that the Trump counterintel op started prior to July of 2016.
Mifsud worked in Europe; Mifsud worked through FVEY (Link Campus); unless Ohr or Comey ragged out Mifsud's name to Horowitz he would have no way to document Joseph Mifsud's involvement in Spygate - no matter what his suspicions were. Mifsud was only peripherally connected with the FBI; he was recruited by Brennan or Halper, maybe Dearlove.