I haven’t read the various DOJ pleadings (and don’t plan to even if they’re available online). From what I’ve seen for 2+ decades now, Judge Lamberth is not a dupe or crook; he’s always had an excellent reputation for fairness. Originally, IIRC, he was appointed by Reagan. If there’s fraud or corruption involved her, I’d place it at the feet of DOJ, not Judge Lamberth.
I would be very curious about the wording the FBI used in the document he gave to the judge requesting the warrant.