| Clue | Source | Date |
|---|---|---|
| Postal service: 2 wds. | ||
| Delivery choice | Thomas Joseph | 27 Jan 2020 |
| Overnight delivery option | USA Today | 07 Dec 2018 |
| Overnight delivery option | ||
| Postal service | ||
| *Post office's answer to FedEx | ||
| *Post office's answer to FedEx | ||
| Alternative to special delivery | ||
| Speedy delivery | ||
| Alternative to special delivery |