Prompted by Khan's intelligence report I've done some looking. Here's a curiosity. On Feb. 28, 2003 4 congresscritters recieved suspicious mail.
This is only reported, as far as I can see, is in the Seattle Times and Minneapolis Star Tribune, and the wires.
____________________________
The Seattle Times
March 1, 2003, Saturday Fourth Edition
Gunfire kills 2 at U.S. consulate, Terrorism notebook
...
...
WASHINGTON At least four U.S. Senate and House of Representatives offices received envelopes yesterday postmarked from Seattle that contained suspicious white powder, U.S. Capitol police said.
The powder was tested and police determined it was not anthrax, said Kimberly Ballinger, Capitol Police spokeswoman.
All postage to the Capitol is taken to an outside location by the Postal Service and irradiated. Even if the white powder had contained Anthrax, it would have been harmless by the time the letters were opened, said Ballinger. The letters had a Seattle postmark, but no return address, Ballinger said. A congressional source said the addresses were typed.
"It happens every day here," she said. "We don't consider it an issue unless it (the tests) turn out positive."
The letters were addressed to Rep. Tom DeLay, R-Texas; the House majority leader; Sen. Norm Coleman, R-Minn.; Sen. Lamar Alexander, R-Tenn., and Sen. Saxby Chambliss, R-Ga.
A ranking homeland-security official said the FBI would investigate the letters, but it was too early to tell what the four elected officials had in common that would make someone send them, and not others, the letters.
___________________________
Coleman's among Senate offices closed by anthrax scare
Rob Hotakainen; Staff Writer
WASHINGTON, D.C. _ Police quarantined the Capitol Hill offices of Minnesota Sen. Norm Coleman and three other Republican lawmakers Friday after an anthrax scare.
"The Capitol Hill police came in with their gas masks and quarantined the office. . . . They shut the place down," said Tom Mason, Coleman's chief of staff, who described the incident as "a false alarm."
Brent Boydston, a staff assistant, said he was opening mail when he encountered "a big puff of white powder" in an envelope. The envelope contained a blank piece of paper and had a Seattle postmark.
Similar letters postmarked in Seattle were sent to the offices of House Majority Leader Tom DeLay of Texas, and freshmen Sens. Saxby Chambliss of Georgia and Lamar Alexander of Tennessee, said John Feehery, a spokesman for House Speaker Dennis Hastert, R-Ill. All the letters tested negative for anthrax, he said.
Mason said no employees were allowed to enter or leave the office, located in the basement of the Dirksen Senate Office Building, while police were present. The substance was sent to a laboratory for testing.
______________________________
Might happen all the time, but I thought it was interesting that the powder was describe as a "puff", compared to the oft "pouring out" like sugar hoaxes. Ie, it sounds floaty. Maybe talc does that.