FBI planting "top secret" stuff -- do not know...
If you don't know, then don't make unsupported allegations. There is no reason to suspect the FBI of anything. They were courteous and correct, which His Majesty didn't deserve. They'd been trying to get those documents back from him for a year. And he kept avoiding turning them over
Finally, when he knew they were coming, he had his goons HIDE some of them where he hoped they wouldn't find them. Alas, when Nauta went to move some of the boxes, he was caught by the security cameras.
every recent ex-president has a library full of documents
Of course they do. The key word is "library". The documents contained in those libraries--the ones that come from the president's time in office--are OWNED BY the National Archive.
The former president in question is not allowed to take them home and read them in bed.