Blog by an Apple Certified Tech

Passwords missing in the new Keychain

This could happen after creating a new Keychain

This generally happens when you are in a network and the password is changed by an admin or helpdesk remotely using the server or AD. This scenario arises when your domain password is expired and you cannot do it yourself and you call your helpdesk to do it for you. Once you set a new Keychain on your Mac, you might not get the old saved passwords.
If this happens all you have to do is, go to saved preferences files and find the new keychain.plist fiile and move it to the desktop and the old file which is now renamed as oldkeychain.plist should be renamed as keychain.plist.

Just those two simple steps will surely bring all your old passwords in the Keychain database that will use your new passwords.