Looks like I dont have access to that old BTC address, but if you look at my old comments I write about my non profit a lot called cannafirm, can I send over any information on that or any other information? ID scans etc??
Usually it takes a lot of work to prove that you are the old owner of that username.
If you can't sign a message to that address,
Theymos can't do anything about it, he rarely recovers account without a sign message.
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https://bitcointalk.org/index.php?topic=497545.0