Trump cultists have their hair on fire about privileged documents, political intel, and the theft of passports. This story explains how the FBI deals with those concerns. As is their SOP, they have assigned a filter team to go through the materials seized. It consists of agents and other experts not assigned to the case. Materials not related to the case and any attorney-client documents are returned to the owner. In this case, there are likely national security experts to screen documents for classified information that may not be marked as such.
An example of how this works was the three passports found in one of the boxes. They were immediately returned to Trump but that did not stop him from playing his victim card.
Of course, some of you will immediately claim that the filter team is “corrupt” and will immediately run to DNC with any juicy stuff they find. It is what you people do.