| Clue | Source | Date |
|---|---|---|
| "Keep in touch!" | LA Times Daily | 05 Jun 2024 |
| "I'll await your letter!" | Universal | 11 Dec 2022 |
| Pen pal's request | ||
| Pen pal's plea | New York Times | 04 Feb 2019 |
| Pen pal's plea | ||
| *"Keep in touch!" | ||
| *"Keep in touch!" | ||
| Going-away request | ||
| Pen pal's plea | ||
| "Please send a letter" | ||
| Correspondence request |