concealedbox

noun
UK /kənˈsiːld bɒks/
US /kənˈsiːld bɑːks/

A box that is hidden so people cannot see it.

The treasure was kept in a concealed box under the floor.


OTHER MEANINGS

2. A storage box built into furniture or a wall so it is not visible.

The old desk had a concealed box for letters.

3. A locked or disguised box used to keep valuable things safe.

They put the jewelry in a concealed box behind the painting.

4. A box that blends into its surroundings to avoid being noticed.

The spy left the papers in a concealed box in the park.