- overflow tray - A less-than-full tray that contains pieces remaining after preparation of full trays for the same destination. Overflow trays may be prepared only if allowed by the standards for the rate claimed.
Glossary of postal terms. 2014.
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tray — A container used in postal facilities to hold letters and First Class Mail flats. It is used as a basic unit of mail quantity for purposes of preparing mail to qualify for discounted postage rates. (Also see full flat tray, full letter tray, less … Glossary of postal terms
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