Cheat mode
Choose the "Codes" selection at the "Options" menu:
THE VITRUVIAN MAN - Louvre Revisted level unlocked
Mansion: Shed box
The code for the box in the shed is 13, 21, 34.
Answer to the Puzzle "OH LAME SAINT"
The Answer to the Anagram puzzle "OH LAME SAINT" is "THE MONA LISA"...