I find it hard to believe any of our Presidents left things in perfect order for the next President.
"perfect order" doesn't mean taking stuff you're not supposed to take.
Lets be real, had Hillary been president and took a couple dozen boxes with her which she was not supposed to. When some were returned, there were some items which were classified and some that were shredded... You think you'd be cool with that?
My guess at this point was that Trump did not return everything he was supposed to return in February. We knew he had more, asked for it and his response was "get a warrant"... so they did.
Probably insignificant and we would never have known had Trump not wanted to play the victim here rather than just turn over the documents he was supposed to turn over 7 months ago.