Tax around crypto profit

Hello, i recently had an crypto theft event and i don’t trust the model anymore. I still have around 5600 usd in binance japan and want to sell it all. The thing is i don’t remember what is my capital and idk how much is the profit.

The amount isnt that much. So question is
1. Do i have to report it in the tax filing?
2. If so, because i don’t remember my capital and hence not sure about the profit, how i should calculate it?

by Bitter_Mortgage_5125