Nine Liars question

The button was a decoy kinda. So Angela pretended to know something so the murderer would call and try to gather what else she knows.

I’m not fully sure how Stevie solved the case - something about keys (all keys look the same, Peter swapped Seb’s keys so he would have access to the woodshed, Peter gave back the keys when he opened the whiskey cabinet) and a toothbrush.

oh that makes sense!! thank u!!