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(Small spoiler ahead)
How to get boxcutter after earthquake? 
I didn't explore the school at "day section", and did not found boxcutter. Now, when I want to find the boxcutter where it should be, it's not there. And i actually don't know what to do,
I've reached the middle of the game(i think) and without boxcutter i can't do anything. Am i actually need to restart the game to get it?(i really dont want to do library section again