Why are there two keys in Level 17?

The silver key opens the outer lock and releases the gold key for the center.

Where do the picture cards go?

Their red and blue emblems fit matching sockets on the circular face.

The Vault: Logic Puzzle Box level guide

medium 4 colors

Level 17 uses crossed-cord sliders and two picture cards to expose a nested circular lock that requires a silver key followed by a gold key.

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Move the red clamps along the crossed white cord until they match the two bends.
Set the cyan vertical slider and open the released barred drawer for the first card.
Open the second drawer and collect the silver key and remaining illustrated card.
Place the red and blue card emblems into their matching sockets on the circular track.
Turn the silver key in the outer gold lock and collect the gold key it exposes.
Use the gold key in the center lock to open the chest.

Colors in this level:

Teal, Gold, Red, Blue

Board notes 5 details

Layout: The teal round chest has barred drawers, crossed white cords with red clamps, a cyan vertical slider, and a concentric face with red and blue emblem sockets.
Goal: Collect both cards and keys, match the emblems to the round face, and open both layers of the center lock.
Opening: Align the two red cord clamps, then operate the cyan slider to release the first drawer.
Danger Zone: The red and blue card emblems fit different opposite sockets; swapping them blocks the lock sequence.
Mechanics: Drawer clues become circular emblems, while the first key mechanically exposes the second.

Why are there two keys in Level 17?
The silver key opens the outer lock and releases the gold key for the center.
Where do the picture cards go?
Their red and blue emblems fit matching sockets on the circular face.