"We will be leaving in a day or two, guys. Cecile, you dropped your ring, but I found it, so here it is."
Tarith hands her the signet ring.

When Jacob knocks on the door, Tarith gets up and opens it.
"Curiosity. I don't see any reason to not head into the vault, just to take a look around. There is no reason for her to know. I can take it with me when we leave, but if you never wanted it to open, why didn't you destroy the keys? Do you mind if I go and take a look?"