The game can be reset by reassembling the box.
Please close and fix the lid and put the lock back (the 4 sliders have to be in the correct position).
Then the symbols on the cryptographic gearwheels have to be recovered, so that the sideward lock can be put back.
The hidden slider is still pulled out.
To hide it, you have to put the keys in the relevant keyholes. Then you can push it back into the box.
Lastly, put the keys back into the holes on the lower surface and turn them by 90 degrees.
Now the game is reset.