I lost keys to several coins on 10/14. painful. Still cant tell if computer glitch or computer hacked. But I don’t want to pay taxes on gains I never realized.
Further I Want the loss write off.
What are next steps?
You can add withdrawal transactions on that wallet and tag them as Realized Loss.
https://help.koinly.io/en/articles/3664156-how-can-i-add-transactions-manually