Investigators suspect he also sent the latest one and were conducting forensic tests to see if they could find a definitive link, another law enforcement official said.
An FBI spokesman in Atlanta said the agency was responding to a report received from US postal inspectors of a suspicious package at 400 Pryor St.in Atlanta - a mail facility. A law enforcement official tells CBS News that Sayoc had a list of more than 100 others in his van when he was captured.
The disclosure of the list came as 56-year-old Cesar Sayoc made his initial court appearance in Miami federal court Monday, and after bomb squads were called to a post office in Atlanta about a suspicious mailing to CNN that was similar to the pipe bomb packages recovered last week.
The Joint Terrorism Task Force is notifying those whose names are on the alleged target list, the official said, and authorities have warned that other packages may still be out there. Authorities believe Sayoc was putting explosives together in his van.
Federal Bureau of Investigation spokesman Kevin Rowson says evidence collected in connection with a suspicious package addressed to CNN has been sent to the agency lab in Quantico, Virginia.
CNN President Jeff Zucker sent a memo to staffers in which he assured them that "t$3 here is no imminent danger to the CNN Center". Federal authorities took Sayoc, 56, of Aventura, Fla., into custody October 26, 2018, in Florida in connection with a nationwide mail-bomb scare.
In US District Court on Monday afternoon, Cesar Sayoc, his salt-and-pepper hair pulled back into a ponytail, remained largely silent, only acknowledging Judge Edwin Torres' reading of the charges against him.
He appeared in court shackled, wearing a khaki prison jumpsuit.
"That's up to them to prove what that is", said Sayoc's lawyer Daniel Aaronson.
"We don't know what they have yet".
There was no immediate word from authorities on Monday about whether the suspicious package in Atlanta is linked to last week's wave of mail bombs.
Associated Press writer Michael Balsamo contributed from Washington.
He said it was found in an Atlanta post office and never got to CNN's world headquarters in the city.
On Friday, FBI Director Christopher Wray said there is strong evidence linking Mr. Sayoc to the bombings that terrorized the nation.