I don't get it.

Read the article, they are saying that the FBI basically half-assed their records search and they think that is suspicious.

According to the suit, the FBI responded to the request on Sept. 4, but said that the bureau only searched it “main file records,” claiming that no records were located.

That was an inadequate effort, as far as the suit is contained.

The complaint says that Leopold appealed the FBI’s response but was denied by the U.S. Department of Justice Office of Information in 2013.

...

“As FBI and OIP are certainly aware, Andrew Breitbart was a well-known public figure and is easily identifiable by the FBI in conducting a cross-reference search,” the suit reads. “As the FBI and OIP are also aware, cross-reference searches frequently turn up records not located in main file searches.”