A dead drop or dead letter box is a method of espionage tradecraft used to pass items or information between two individuals (e.g., a case officer and an agent, or two agents) using a secret location. This method stands in contrast to the live drop, so-called because two persons meet to exchange items or information.
Known at one time as the Dead Letter Office, the Mail Recovery Center works to reunite undeliverable packages and letters with either sender or recipient. Processing centers and retail and delivery units send mail items without valid addressee and sender information to the MRC, where MRC staff act as detectives.Jan 11, 2016
Something that’s dated is very obviously old-fashioned or out of style. Your grandmother’s expectation that you send her a written thank-you note whenever she gives you a gift might seem a little dated to you. Some people can wear thrift shop clothes from the 1980s and look stylish, while others just look dated.