There is not a single problem with how the FBI and DOJ handled this.... Merrick Garland and Christopher Wray made certain all eyes were dotted and tees were crossed....
The search warrant was legitimate, the search itself was legitimate, and the process to sort out any attorney client privilege stuff by a separate team, before giving to the FBI was legitimate, and all according to the Search Warrant specifications, the Judge Magistrate approved, and all according to protocol standards for legal searches.
They were very careful this time, to make certain no one messed up and did something foolish, or illegal. They knew what was at stake, and Trump's penchant to lie and cry victim.
The collection agents for the search warrant had to open boxes to determine if they met the search warrant parameters....that is PROCEDURE, silly one!
And close circuit tv security in every corner of the mansion, watched the agent's every move. No one planted evidence.