You are missing the point. It doesn't matter when he took them. What matters is he had them in his possession and was no longer president. The FBI tried for months to get him to return them and he refused,
There is now a separate investigation in to Trumps mishandling of these docuemnts.
"The Justice Department and FBI found new evidence of possible obstruction by the GOP firebrand tied to their investigation into classified documents recovered at Mar-a-Lago last year, the
Washington Post reported Sunday.
After Trump’s advisors received a subpoena in May demanding the records back, the 76-year-old ex-commander-in-chief leafed through some of the boxes of top-secret government documents in an apparent effort to keep certain things in his possession, according to the report, which cited people familiar with the probe."
nvestigators also have evidence that indicates Trump told others to mislead government officials in early 2022 – before the May subpoena – when the National Archives and Records Administration was working to get back documents from Trump’s time in the White House, the Washington Post reported.
The Justice Department and FBI found new evidence of possible obstruction by the GOP firebrand tied to their investigation into classified documents recovered at Mar-a-Lago last year, the Washingto…
nypost.com