What’s the problem? Trump and Sessions are playing 9D chess and already have all this in the bag. Even Mueller is in on draining the swamp! /sarcasm
Do you really think Trump is stupid? He knows all and knew all this at the time. in fact he knew it before ;) It was all done under the watchful eye of the IG and there are also backups, partial backups and no such agency copies. The period is from transition through firing of Comey whereupon Comey’s office was taken down by a special team including Trump’s longtime security guy to make sure everything remains kosher. The question remains, is Mueller in on the sting or it’s first exhibit ... TBD