I'm sorry but I'm having a hard time believing it. So, you're claiming that you found the wallet file on the darknet, where exactly, why was it available to download, and why was it given away if it was that simple to redeem it?
Perhaps you could sign a message from one of those addresses.
I'm sorry but the first address states that it's owned by the MtGox hacker.
Can you tell me what I gain by making up what I say in this post? nothing!! I am simply telling what I found and I would like to know what I can do or if I can get in trouble for trying to transfer those bitcoins to my personal wallet. Regarding your question, I found it on a very old Russian page on the deep web, many of the transactions the wallet is from 2009