USMAIL
| Date | Clue |
|---|---|
| 2021-08-28 | Letters on a box with letters |
| 2019-03-19 | Post office service |
| 2016-09-27 | Service symbolized by a blue-and-white eagle |
| 2015-03-18 | Inscription on a classic letter box |
| 2012-09-13 | Letters in - or on - boxes |
| 2012-03-17 | Words below an eagle |
| 2004-11-29 | Label on a street-corner box |
| 2003-11-04 | Inscription on a letter box |
| 2002-08-15 | Label on a street-corner box |
| 1999-11-02 | Daily delivery |
| 1998-08-14 | FedEx alternative |
| 1997-01-24 | Letter box deposits |
| 1996-08-02 | Pony Express bundle |