Any information obtained through a FISA warrant, for example, probably cannot be used in a criminal prosecution -- so the DOJ cannot really publicly acknowledge that they know anything about it.
Boyd's letter to Nunes could very well be a backdoor invitation for Congress to "officially" tell the DOJ something the DOJ already knows but can't admit.
In my view the claim of “currently unaware of any wrongdoing related to the FISA process” is not sustainable given this FISC court case which was declassified and published in May 2017 by DNI.
https://www.dni.gov/files/documents/icotr/51117/2016_Cert_FISC_Memo_Opin_Order_Apr_2017.pdf
Start at the bottom of pg 83 and read what the FBI did.
Short summary: the FBI had access to parts of FISA info they should not have had, and they gave it to “contractors” for analysis. Then they lied about the fact that they were contractors.
Frankly the whole document is one long list of “wrongdoing related to FISA” !
And Boyd is ridiculous to claim otherwise.