Obnoxious excerpts from the article:

The raid on Mar-a-Lago was based largely on information from an FBI confidential human source, one who was able to identify what classified documents former President Trump was still hiding and even the location of those documents, two senior government officials told Newsweek.

The officials, who have direct knowledge of the FBI's deliberations and were granted anonymity in order to discuss sensitive matters, said the raid of Donald Trump's Florida residence was deliberately timed to occur when the former president was away.

FBI decision-makers in Washington and Miami thought that denying the former president a photo opportunity or a platform from which to grandstand (or to attempt to thwart the raid) would lower the profile of the event, says one of the sources, a senior Justice Department official who is a 30-year veteran of the FBI.

Both senior government officials say the raid was scheduled with no political motive, the FBI solely intent on recovering highly classified documents that were illegally removed from the White House.

"...the FBI feared that the documents might be destroyed..."

The affidavit to obtain the search warrant, the intelligence source says, contained abundant and persuasive detail that Trump continued to possess the relevant records in violation of federal law, and that investigators had sufficient information to prove that those records were located at Mar-a-Lago—including the detail that they were contained in a specific safe in a specific room.

"In order for the investigators to convince the Florida judge to approve such an unprecedented raid, the information had to be solid, which the FBI claimed," says the intelligence source.

Because the Secret Service is still responsible for protecting the former president, his family, and his property, the FBI had to coordinate with the Secret Service to gain access to the grounds.