I know I'm a bit late but I just accessed an old email and realized I had some BTC left on MtGox. I guess it's too late to file a claim? Does anyone have the database leak so I can confirm how much I had left?
You can check this article
Mt. Gox Postpones Repayment Deadline to 2025 that has a link to an official guide from Mt.Gox.
Notice Concerning Change of Repayments Deadline . You can read the full document for more details about their Rehabilitation Claim Filing System.
I am unsure and don't understand your question, data leak as proof to claim your bitcoin. It sounds ridiculous because you need more than a Bitcoin address to claim you are actual owner.
2． InquiriesFor any inquiries, please log into the MTGOX Online Rehabilitation Claim Filing System (i.e., the system accessible via
https://claims.mtgox.com/; the “System”) and use the inquiry form accessible from the “FREQUENTLY ASKED QUESTIONS (FAQ)” button in the upper right corner of the screen.
Thanks for the link. I just wanted to check how much BTC I had in my account as I am not entirely sure (and if the amount is too small, I won't bother with the claim).