The classified documents found at former Vice President Mike Pence's home reportedly included background briefing memos prepared for his foreign trips.

A source told CNN that some of those government records were likely used to prepare Pence for foreign meetings while he was in office.

The source added that the documents might have been overlooked as they were tucked into old trip binders during the packing process.

Another source told the outlet that the classified documents would not have been visible unless the packers went through the binders page by page.

Sources told CNN noted that these briefings sometimes include information on foreign leaders. However, there are times that it would also have more sensitive information.

A U.S. official also told the outlet that the Federal Bureau of Investigation (FBI) is working with U.S. intelligence agencies in reviewing the documents to determine the level of classification and possible risks of having such material placed in an unauthorized location.

A source also told CNN that based on what they were told, there was nothing unusual with the documents, with the classification markings on the "lower level."

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Mike Pence Classified Documents

Mike Pence's lawyers discovered the roughly 12  classified documents last week at the former vice president's home in Indiana. It was initially handed over to the FBI before being turned over to the National Archives, BBC reported.

Before Pence discovered his own batch of classified documents, investigators were already looking into President Joe Biden and Donald Trump's classified materials.

Pence's representatives sent a letter to the National Archives regarding the secret materials. In a separate letter, Pence's lawyers said the FBI bypassed "standard procedures" and requested the "direct possession" of the classified documents.

Pence sought legal help from a specialist in handling the classified materials "out of an abundance of caution."

Trump has defended his former vice president in a Truth Social post, saying that Pence "never did anything knowingly dishonest in his life."

Pence initially said he was confident reviews of the classified documents in his home were done in a "thorough and careful way."

Mike Pence's Previous Comments About the Classified Documents

Mike Pence was asked several times over multiple interviews in the past five months if he took any classified materials with him when he left the White House.

The questions started when the FBI searched Donald Trump's Mar-a-Lago residence in Florida and found boxloads of classified documents.

Pence answered the interviews by saying he had been careful and was unaware of any classified materials in his possession.

He was asked in Iowa a day after the FBI searched Trump's home if he took any classified documents with him when he left office, to which he answered, "no, not to my knowledge."

In an ABC interview, he also denied having classified documents taken from the White House, replying to the question with, "I did not," Newsweek reported.

Currently, Donald Trump and Joe Biden are facing investigations for possession of classified materials. Trump earlier claimed that he had "declassified the documents" before he took those to Mar-a-Lago.

READ MORE: Classified Documents Found in Joe Biden's Former Office as U.S. Vice President Being Reviewed by DOJ

This article is owned by Latin Post.

Written by: Mary Webber

WATCH: Documents Marked Classified Found at Mike Pence's Home - From CBS News