dead letter box


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dead letter box

or

dead letter drop

n
(Communications & Information) a place where messages and other material can be left and collected secretly without the sender and the recipient meeting
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
We should have done a DLB (dead letter box) or brush contact on the riverside."
We should have done a DLB (dead letter box) or brush contact on the riverside." Prosecutor Andrew Edis said this was a "quite complicated and quite risky" exercise which could only be explained as an attempt to hide evidence -- and said it was "inconceivable" that Brooks did not know what was taking place.
We should have done a dead letter box or brush contact on the riverside."