Hacked Account - which address to use to sign a message

[CYPERbg]

So my account was hacked because of the May 2015 forum hack and now I want to recover it.
Btw can someone explain to me why is it better to lock your account by email in order to secure it and not just confirm the email change by the same method?
Basically if the password or email change needed to be confirmed by the original email then I wouldn't have a hacked account now.

Back to the topic: I reckon the hacker removed my signature, which is still present in Google's cache: https://webcache.googleusercontent.com/search?q=cache:NXp8Xh9Lp54J:https://bitcointalk.org/index.php%3Ftopic%3D2041720.60+&cd=16&hl=en&ct=clnk&gl=uk
I can sign a message from that address
or
use another one that I sent over a PM, but how do I get the PM ID when I don't have access to my account?

Cheers

[KWH]

So my account was hacked because of the May 2015 forum hack and now I want to recover it.
Btw can someone explain to me why is it better to lock your account by email in order to secure it and not just confirm the email change by the same method?
Basically if the password or email change needed to be confirmed by the original email then I wouldn't have a hacked account now.

Back to the topic: I reckon the hacker removed my signature, which is still present in Google's cache: https://webcache.googleusercontent.com/search?q=cache:NXp8Xh9Lp54J:https://bitcointalk.org/index.php%3Ftopic%3D2041720.60+&cd=16&hl=en&ct=clnk&gl=uk
I can sign a message from that address
or
use another one that I sent over a PM, but how do I get the PM ID when I don't have access to my account?

Cheers

IMO, this would be better proof: https://archive.li/9Fkj3