The password of victim's locker is ACE.
The password of locker of victim's mother is 1614.
Piano Code
The code to the piano lock box in the victims apartment: C, #, C, #, C, #, B, C, #, D , E , D, C, #.
Typewriter Puzzle
At the end of the investigation, you need to choose the right letters on the keyboard sent from the crime lad. There are 12 letters each stacked 3 high.
First line ... second H, third Y, third Q, first A, first S, third J.
Second line first F, second R, first E, second T, second C, third O.