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The symbol is removed from newer versions, don't worry about that. The game is tracking your progress, it'll let you in down there when it thinks you're ready. There are a lot of things which change on different playthroughs so, yeah, you're gonna see things happen differently in your game.

Have you opened the combination drawer in the office yet?

ooohhh ok cool, and no i cant figure out the combination 

Check the journal page you found in the office, and keep an eye out for any numbers hidden about the house. 

ok thanks for the hint!