1. In this case we know for a fact that documents that were legally required to be turned over were in the boxes that the DoJ was not allowed to search. This means your assertion that nothing was “hidden” is factually inaccurate.
2. The DoJ was explicitly forbidden from looking in the boxes by Trump’s lawyers. Your source says the FBI never asked for a search. Your claim is the DoJ did ask for a search and Trump allowed it in a limited fashion. Therefore, you disagree with your own source. The FBI agent wasn’t there on June 3rd, so he wouldn’t know the facts.