I'm repeating myself a bit here, but this is what I think is happening:
Trump held on to classified documents and memorabilia. he put them in his basement.
The FBI found out and asked him to give it all back.
Trump said no. But he did put a lock on the door and gave back some.
The FBI asked again nicely for the rest of it, and again. This went on for a year or so.
Then the FBI realized there was a national security problem here, with improperly stored documents and asked again, in person, by the head of the FBI counter-intelligence unit to give the stolen merchandise back.
Again, trump said no.
So the FBI decided the stuff was never coming back unless they took it back So they took it back.
So three points:
1/ this is a national security issue and a law breaking issue.
2/ The FBI asked nicely for a year and trump continued to break the law
3/ Finally the Feds figured they are law enforcement and so they started enforcing the law.
I'd ask the seditionists....how much longer should the FBI have waited? another year? two years? A decade? until trump sold it to the highest bidder as memorabilia?