Help getting private encryption key for home directory

When I setup Mate on my machine, I selected to encrypt my home folder and created a password. The first time Mate booted, there was a information windows that provided a command to view my private encryption key in case ■■■■ hit the fan, (so to speak).

I did not run the command, and do not have possession of my private key. I would like to what the command is or how to view the information window again. Thanks in advance!!

Hello
Just run the following command:

ecryptfs-unwrap-passphrase

This will prompt you for your normal password (which is called passphrase fsr), then deliver the encryption key.
It's weird that this popup disappeared though, it's supposed to pop up at each login until you run the action.