| Clue | Source | Date |
|---|---|---|
| Unknown quantity | Universal | 21 Feb 2019 |
| Unknown quantity | ||
| Unknown quantity | Eugene Sheffer | 07 Jul 2017 |
| Unknown quantity | New York Times | 06 Nov 2016 |
| Unknown quantity | ||
| Unspecified quantity | New York Times | 11 Jul 2015 |
| Unspecified quantity | ||
| Unspecified quantity | ||
| An unknown quantity | ||
| Unknown quantity | ||
| Who knows how much |