jkoil did not use BTC address on this forum. Only official address of jkoil is the one, which was set to him in NEM ICO. And from that address/wallet was sent a signed message to recoveries_*@bitcointalk.org 10 days ago.
Seems to be a difficult case ...
It doesn't matter if you do have the option of proving your account by sign messages from whatever address you've posted in the past, I'm sure the recovery team will take that into account.
If you have emailed them then I believe your case is in the queue and you will have to wait patiently. They can get it done in a week, a month, or maybe a year if all the evidence you present isn't convincing enough
[just a guess] but hopefully not. But be patient, your case will be processed soon after the investigation.