From Longman Dictionary of Contemporary Englishout trayˈout tray noun [countable] BBOa box on an office desk where you put work and letters which are ready to be posted or put away → in tray
Examples from the Corpus
out tray• Miss Foley was ready to go now and had come up to the desk to clear his out tray.From Longman Business Dictionaryout-trayˈout-tray noun [countable] British EnglishOFFICE a container used to hold letters, papers etc that have been dealt withSYNout-basket AmE → compare in-tray 