Here are the five different lock combinations for the treasure rooms.

Room	Combination
Catacombs	These are four stones on either side of the iron bars / 4132
Chimney	This is a valve by the stairs in the Arsenal District / 3241
Forest Hut	These are four buttons two on each side of the second story fire place / 2431
Victors secret	These are books in the bottom floor of the library in The Net of the Mask building / 1431
Windmill Tavern	These are four stones on the balcony inside the tavern, all the way on the left side / 1324