Personally I will believe it when I see it. Trump had the ability to declassify. Trumps lawyers sent a letter saying that to the DoJ and claimed the letter was exculpatory evidence the DoJ was required to include in any attempt to get a search warrant. Which the DoJ did include in the application.
In the second such letter, which is attached as Exhibit I, FPOTUS COUNSEL 1 asked DOJ to consider a few "principles," which include FPOTUS COUNSEL l's claim that a President has absolute authority to declassify documents. In this letter, FPOTUS COUNSEL 1 requested, among other things, that "DOJ provide this letter to any judicial officer who is asked to rule on any motion pertaining to this investigation, or on any application made in com1ection with any investigative request concerning this investigation."
From what I understanding the statute relating to all this does not specify classified documents.
2 18 U.S.C. § 793(e) does not use the term "classified information.'' but rather criminalizes the unlawful retention of "information relating to the national defense." The statute does not define "information related to the national defense," but courts have construed it broadly. See Gorin v. United States, 312 U.S. 19, 28 (1941) (holding that the phrase “information relating to the national defense" as used in the Espionage Act is a "generic concept of broad connotations, referring to the military and naval establishments and the related activities of national preparedness"). In addition, the information must be "closely held" by the U.S. government. See United States, v. Squillacote, 221 F.3d 542, 579 (4th Cir. 2000) (''nformation made public by the government as well as information never protected by the government is not national defense information."); United States v. Morison, 844 F.2d 1057, 1071-72 (4th Cir. 1988). Certain courts have also held that the disclosure of the documents must be potentially damaging to the United States. See Morison, 844 F.2d at 1071-72.
If the documents Trump had were declassified that means they should be free for anyone to get via FOIA. I imagine some journalists are going to have fun with that.