Cell key with note from a friend, at the beginning of the game in Dishonored

Corvo's Cell Key is a key in Dishonored

Key Name

Corvo's Cell Key

Key Opens

Corvo's Cell, the prison cell in which you are locked in at the beginning of the game

Where to find Corvo's Cell Key

You get it along with the Anonymous Message in the food tray near the bread. The guard leaves this in your jail cell in Coldridge Prison. Use key to open the cell door.