secret box

Translations
секретная коробка
тайная коробка
потайной ящик
шкатулка с секретом
Definitions
A box that is kept hidden or whose existence or contents are meant to be concealed.
A box used to store confidential or private items.
A puzzle box with a concealed opening mechanism or compartment that requires a special method to access.
Words
secret

adjective
секретный
box

noun
коробка