I've been semi-running around aimlessly in my runs to find 5 pieces of evidence, the hand print, the button, Waltz chalk outline, the fridge poster, and one of the chalk outlines elsewhere in the manor. I'm Curious which pieces of evidence are required because I've noticed that the elevator wont start until after mike starts his "this horror show is making my skin crawl" dialogue

BUtton, blood trail near the button,hand print, chalk outline and fridge:)