This fits your .

Object: Open the Box Can you solve this secret puzzle? Your mission, if you accept it, is to open the "Secret Opening Box". You have to decide what to store here, the decision is yours.
Description:
Material: wood; 
Size: 4.8"*1.46"*1.34"
Age 6+

Features:
- Intelligence game ,great challenge for kids and adults
- Relax, develop the brain, flexible fingers. Challenge your children's imaginations
- Kongming lock is known as a kind of ancient and mysterious educational toy, which combines abstruse mathematical and physical principles perfectly

Brain Teaser Puzzles Educational Wood Toys Lock Box Game - B01M8PB8WV