Yes, yes, let's deflect away from the "nuclear documents" being nothing of the sort and the Mar a Lago raid being a dud.
I'll let you dig up the claims about nuclear information from the *original* press reports. (I think it was NYT, but I don't exactly recall.) That reporting has certainly attracted attention and has bounced around the internet. It has also been "reframed" in media accounts that don't have the original source for the claim, but now all of us do.
As part of their response to the ex-President in the Trump v. USA case about the "special master", the DOJ filed a subpoena issued by a grand jury in DC for documents not recovered early this year. It lists a sequence of markings from classified documentation they are looking for.
"Any and all documents or writings in the custody or control of Donald J. Trump and/or the Office of Donald J. Trump bearing classification markings, including but not limited to the following: Top Secret, Secret, Confidential, Top Secret/SI-G/NOFORN/ORCON, Top Secret/SI-G/NOFORN, Top Secret/HCS-O/NOFORN/ORCON, Top Secret/HCS–O/NOFORN, Top Secret/HCS-P/NOFORN/ORCON, Top Secret/HCS-P/NOFORN, Top Secret/TK/NOFORN/ORCON, Top Secret/TK/NOFORN, 1- Secret/NOFORN, Confidential/NOFORN, TS, TS/SAP, TS/SI-G/NF/OC, TS/SI-G/NF, TS/HCS0/NF/OC, TS/HCS-0/NF, TS/HCS-P/NF/OC, TS/HCS-P/NF, TS/HCS-P/SI-G, TS/HCS-P/SI/TK, TS/TK/NF/OC, TS/TK/NF, S/NF, S/FRD, S/NATO, S/SI, C, and C/NF."
SI is "signals intel", NOFORN is "do not distribute to foreign persons or gov.", HCS is "human intel (spies)", SAP is "special access program", TK is related to satellite data collection, and ORCON is "originator controlled" (ie. declass by original classifier).
There is one more marking that really matters here: "FRD" is "former restricted data" a DOE marking that refers to information that while not classified is covered by the Atomic Energy Act.
Anyone who had seen the GJ subpoena and understood those codes (or knew where to find them) could know that they search included nuclear information. Now who had that subpoena and could have shared it:
The Grand Jury in DC
The Chief Judge in DC supervising the GJ
The DOJ lawyers working on the investigations
The FBI agents working on the case and serving the subpoena
All of these people have an obligation to keep the contents of the investigation and GJ work confidential.
There was another, smaller, group of people that knew the contents of the subpoena and *didn't* have an obligation to keep the subpoena confidential:
The person receiving the subpoena (Donald J. Trump) and his lawyers. They have the right (unless under seal from the judge) to tell anyone and everyone that they got a subpoena. (The DOJ filing from last night indicates that the Trump team *did* release information from the subpoena which is how they got the DC CJ to release it.)
That subpoena from May can be found on page 11 of this filing from the DOJ last night:
https://storage.courtlistener.com/recap/gov.uscourts.flsd.618763/gov.uscourts.flsd.618763.48.1_5.pdf
So far everything that looks like a DOJ/FBI leak can be traced to information the reporters could have gotten from Trump or his lawyers. In this instance, the most likely explanation is that a reporter with close contacts with Trump or his inner circle was shown the DC GJ subpoena, recognized the "FRD" marking as referring to nuclear information and included that item as part of the "things sought" by the search in the article.
No original reporting (or DOJ filling) has claimed that such information was found, but it was (not so clearly) on the list of things sought.