this is insane , you never knew where the 2000 btc went .??
someone just hacked into your wallet and withdrew all the amount , to a another bitcoin address and you can't track them .
have you tried contacting blockchain .io about it.
sometimes , with the hacked address you can track the exchangers if the hacker converted it to money into some bank or the anothr , it is still possible to track it ,
mostly it might have been only gone to an exchanger if the culprit wanted to exchange it.