postal receipt

Sometimes, to cover their tracks with postal receipts, investigators said businesses mailed empty boxes to customers' homes.

It's a copy of the postal receipt.

On October 2, 1910, the Medford Daily Tribune reported that "No better criterion of city's growth can be named than its postal receipts."

In 1933 the Post Office decided to expand the structure, a move that expressed confidence in Schenectady's growth since postal receipts were declining at the time due to the Great Depression.