Buying alt coins that have vanished

Hi accountants, we can get tax deductions on our loses. After making profits in this cycle I want to sell or offset my loses by selling coins that went to zero in 2017. Literally $2000 down to $0.

But we can't sell, we have the coins in the wallet but coin has rugged and disappeared from this planet.

This coin has disappeared so how can we get a tax deduction with it? including the exchange saying you can't sell your tokens try transfering to another wallet. If I transfer to another wallet that doesn't do anything as coins are no longer in existence. The project is deleted.

Can we burn the coin or put in a fake address that goes to thin air in this case we can have a so called sell invoice to claim on tax?

Or is a screenshot of the value good enough for tax? Baught $2000 in 2017 - current wallet value $0 in 2025.

Thanks in advance. ....…....... (Offset my 2017 losses for this years profits to benifit tax.)