Sayoc's white van, which was seized by authorities, had numerous stickers showing President Donald Trump and Vice President Mike Pence, as well as a "CNN SUCKS" sign, according to a screenshot posted on Twitter by a CNN reporter.
Within minutes, the building - which houses the NY offices and studios of CNN - was evacuated after a package that appeared to contain a pipe bomb and had wires was screened in the building's mail room. "The protectees did not receive the packages nor were they at risk of receiving them".
The president's pleas for harmony came as law enforcement officials scrambled to find the perpetrator of the thwarted bomb attacks against former president Barack Obama, Hillary Clinton, CNN and others.
NYPD officers in bomb suits were seen outside of the Time Warner building and a containment truck was also on scene, fueling further speculation that authorities suspect bombs were involved.
The official says investigators believe the explosive is linked to one found Monday at the compound of liberal billionaire George Soros.
The bomb packages were sent as the nation prepares for November 6 elections that will decide whether Democrats take control of one or both houses of Congress from Republicans and deny Trump the majority his party now holds in both.
The targets of the bombs were some of the figures most frequently criticised by Mr Trump.
All the confirmed bombs appeared to come from the same person or persons, said John Miller, New York Police Department's head of intelligence and counter-terrorism, who briefed reporters in New York.
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Investigators probing crude pipe bombs sent to prominent critics of President Donald Trump are trying to determine whether the devices were meant to detonate or simply to sow fear, law enforcement officials told The Associated Press Thursday. "This egregious conduct is abhorrent to everything we hold dear and sacred as Americans".
"Other Republican leaders said the same".
Even as everyone condemned the unknown sender and Trump decried political violence, blame flew for the corrosive nature of America's political conversation.
The parcel intended for Holder ended up rerouted to the return address printed on all the packages - the Florida office of U.S. Representative Debbie Wasserman Schultz, who formerly chaired the Democratic National Committee, according to the Federal Bureau of Investigation.
The tape on the pipe is "an investigator's dream", he said, recalling a case in Texas that was solved because the fibers on the tape were traced to the bomber's dog. Officials said the devices are being examined by technicians at the FBI's forensic lab in Quantico, Virginia.
Law enforcement officials did not comment on the possible motives behind the crimes or whether political ideology may have played a role.
The US Secret Service has intercepted "potential explosive devices" addressed to former President Barack Obama and Bill and Hillary Clinton.
Also Wednesday, a police bomb squad was sent to CNN's offices in New York City and the newsroom was evacuated because of a suspicious package. The CNN package was addressed to former CIA Director John Brennan, who has publicly clashed with Mr Trump and is a regular television contributor. The FBI is doing a nationwide manhunt for whoever is sending the pipe bomb packages, and officials are trying to determine if the sender or senders was trying to sow fear or actually cause physical destruction. I think that we're running a great campaign. Nor would they say why none of the packages had detonated, but they stressed they were still treating them as "live devices".
Two more explosive devices - one addressed to Senator Cory Booker and the other to former director of national intelligence James R. Clapper - were discovered at postal offices in Florida and NY.