Also yesterday, the U.S. Treasury closed a mail facility near its main building in downtown Washington after a suspicious letter was found bearing a Trenton, N.J., postmark. The letter, with a handwritten address, was not sent to any high-ranking Treasury official.
I wonder when the suspicious letter was postmarked.
Article above says the building's landlord had noticed FBI staking out the mail drop box nearby in "previous two days."
Letter received yesterday(?) in D.C. = letter posted from that drop box three days ago, possibly?