Law & Order: Justice Is Served

Hint: Piano Code
Here is the code to the piano lock box in the victims apartment: C, #, C, #, C, #, B, C, #, D , E , D, C, #.

Hint: 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.

Hint: Passwords
The password of victim's locker is ACE.

The password of locker of victim's mother is 1614 or 6461.

Book 'em, Louie.