Where are autofill values stored?

Not exactly. The "Form Values" document is the document that stores information pertaining to filling out online forms. It just has your name, email, and all that other stuff that will pop up when you fill out a form that requires information, not passwords. If passwords were stored there, it would be very insecure, as you can access that file without a password.

All your passwords are stored in the helper application "Keychain." You can either open that application directly, select the files you want to copy, hit the copy button down below, and enter your keychain password, or you can go to ~/Library/Keychains, and copy the keychain you want to save somewhere else. I am sure the first one works, but not so sure about the second one, since I've never had to try it.

The random symbols in the form values file mean something to the computer, just like the file it bases it's junk mail algorithm off of, and countless other things only the computer needs to see or understand.

Good luck!

The random symbols in the "Form Values" file are because it is AES encrypted. There is a tool here that you can use to extract them.

http://encase-forensic-blog.guidancesoftware.com/2013/06/safari-form-values-decr yptor.html