Here's your final riddle. Find the 3 numbers missing in this image, they are the combination to open the lock on the chest ! (No need to search the apartment anymore)
You are almost there
A few more hints, just in case.
Hint 1
Hint 2
Hint 3
Hint 1
Well, you need four numbers, so maybe it's the date associated with the picture.
Hint 2
Well, it looks like a revolution to me.
Hint 3
The combination of the lock is 1830, the year of the Belgian revolution !