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Didn’t you notice a little picture hanging on a wooden wall just before?
Count the objects in the open trunk, but be careful: the order is given by the picture!
The wall picture shows 4 objects (REVOLVER, CANNON BALLS, PIRATE HAT, BOOTS) and in the open trunk there are, among those listed in the picture, the following objects: 1 REVOLVER, 3 CANNON BALLS, 3 PIRATE HATS, 0 BOOTS. The correct combination is therefore 1330.