lol. i really wish one of them had read it before, but no, i don't think its possible as they didn't have a clue most of the time, i had to endure 10 minutes of one of them RPing buying lightbulbs. two of the player had never played an RPG before, the other two had only played CoC once before. the book had only been out a few weeks before as well so its pretty remote. I'll admit them finding the bones early was probably my fault as i mentioned the tree twice which got one of the players interested. it was him being a bit out of character saying that i had kept mentioning so was interested, but i was trying to help them visualise the scene and in horror film, they always foreshadow important elements.
I can't remember specifics but they found the bones after they'd found the room and the clues for the ritual so put 2 and 2 together that it was the artist who was buried. then when the work crew found the painting in the cellar, they figured out it was one of his. one of the new players suggested putting the bones in the cellar for safe keeping, then when it all kicked off, they completed the ritual and threw the bones in as it was his painting that was causing the problem, or so they thought. in their mind, the artist was the root of the problem, not that he was just predicting it. they got the right answer but the wrong theory.