| Clue | Source | Date |
|---|---|---|
| Hotel door opener | Thomas Joseph | 27 Aug 2025 |
| Modern door opener | ||
| Handout at check-in | New York Times | 14 Mar 2020 |
| Door opener | New York Times | 29 Jun 2017 |
| Door opener | ||
| Check-in handout | ||
| One may be swiped at a hotel | ||
| One may be swiped at a hotel | ||
| Hotel room door opener | ||
| Pass to get in an inn | ||
| Electronic opener |