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lost and found
A specific receptacle, area, or desk maintained in some public venue or facility in which lost items that are found by someone are kept until they are reclaimed by their owners. Sometimes hyphenated. I'll go back to the mall tomorrow and check the lost and found for my glasses. Excuse me, do you have a lost-and-found? I misplaced my wallet earlier, and I was wondering if anyone picked it up.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
an office or department that handles items that someone has lost that have been found by someone else. The lost-and-found office had an enormous collection of umbrellas and four sets of false teeth! I found a book on the seat of the bus. I turned it in to the driver, who gave it to the lost-and-found office.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.