11.   I could only imagine that the money, in a plain unmarked envelope, had fallen out at the Supreme Court.

12.   The blades were concealed in plain white envelopes bearing Las Vegas postmarks, officials said.

13.   The letter bombs sent to the United Nations were in plain white envelopes with computer-generated addresses and no return address.

14.   The typewritten letter was mailed in a plain envelope, with a handwritten address.

15.   Waving a plain white envelope containing the secret access code and a personal note from the artist, the two admitted it was their first purchase ever at auction.

16.   The regulations also suggest they should reduce the size of fonts and space in their letters, and use plain envelopes to cut down on printing and paper costs.

17.   They arrived in plain white envelopes bearing computer-generated addresses, authorities said.