The F.B.I. convince a judge that it had probable cause that a crime had been committed, page-512

Trump took documents he wasn't legally entitled to take,
Sorry, have you seen the documents? Didn't think so... speculation.

Trump didn't return the documents despite multiple opportunities,
One thing we do know for sure, there was an on-going, amicable discussion with the records office.
They had even visited Mar a lago, and advised a lock on the door.
More speculation on your part.

The search warrant revealed a trove of documents trump had taken without authority,
Again, you've seen the documents? The contents have been released to the public?
Didn't think so, you're full of it.
We do however know they took documents belonging to Trump they shouldn't have... his passports and seems privileged communications etc.

Trump used it as an opportunity to fleece the gullible of cash.
...
The only fleecing is on you gullible lefties that this wasn't a political hit job (which will backfire).