Verifying emergency decryption code I encrypted my computer with FileVault full disk encryption on Yosemite. FileVault gave me an emergency decryption code to use when I forgot my password.

For some reason, when I changed my account password while the drive was being encrypted it gave me another emergency code. How can I verify which one works?
Can restart the computer in recovery mode (Cmd-R, while starting up).   Go to Disk utility.   Encrypted disk will be greyed out.   Right click (option- click) to unlock it.   See which of your codes work.