You can file a total loss of value or control of coins by going to Dashboard > Import More Transactions > Manual Entry > Outgoing, "Loss" from Dropdown.

For tax purposes, make sure you keep good records of the loss of your coins.

You can find how the IRS defines Casualties, Disasters, and Thefts here:

A casualty is the damage, destruction, or loss of property resulting from an identifiable event that is sudden, unexpected, or unusual.

· A sudden event is one that is swift, not gradual or progressive.

· An unexpected event is one that is ordinarily unanticipated and unintended.

· An unusual event is one that isn’t a day-to-day occurrence and that isn’t typical of the activity in which you were engaged.

Generally, casualty losses are deductible during the taxable year that the loss occurred.

Here is a video showing how to mark as Stolen/Lost:

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