They keep records, you can't take a top secret document without signing it out. They knew he took these, they knew he didn't give them back, but it is a matter of timing.
You want this after Mar a Lago, so much better, so much more impactful.
You also want them to hide this during the election, just one more crime to add to their list. Makes everything illegitimate.
Then you only want one location released at first so that they can downplay it, makes things much worse as more and more stuff comes out later.
It's OK if they lie about it, helps people see them as liars.
The facts are the facts, it was a crime, anyone else would be fired for this. It rises to the level of impeachable offense, the Republicans control the House and the Democrats don't want Biden running in two years. It is the convergence of the perfect storm on Biden to get rid of him.
What is good for the goose is good for the gander, if their were confederates in the Secret Service spying on Trump why wouldn't their be the same spying on Biden.