He hid the KEY in her.
Westworld Season 2, Episode 10
If Robb Stark falls,
Sansa Stark is the KEY to the North.
Game of Thrones Season 3, Episode 4
handed over the KEY,
and that was it.
Breaking Bad Season 5, Episode 13
Did you forget your KEY?
The Big Bang Theory Season 2, Episode 11
"Of a Seat, an old one,
in the original KEY holder.
Money Heist Season 1, Episode 7