@GazetaBitcoin
First of all I apologize to you for my research.  In fact, the answer to this quiz was not added to my score the day I answered it.  Actually I spent a lot of time trying to figure out what the answer would be but I didn't get the right answer.
But from here I got two answers close.  I would be eternally grateful if you could let me know via personal message which would be the correct answer.

Kevin (Btt account: toasty): Owned 259684 BTC

Ref : https://bitcointalk.org/index.php?topic=20207.msg252680#msg252680

@MtGox ( Btt account: MagicalTux) He doubted the Kevin 100%. Because Kevin account created and login just same as hacked and hackers.

Ref: https://bitcointalk.org/index.php?topic=20250.msg253411#msg253411