I imagine they aren't reported as they were not actually sold, if they were "sold" for $0. It would seem then that they simply became worthless. It is common to report investment sales that are not reported on a Form 1099-B.
You can report the sale of them as $0 proceeds so you can deduct their cost. You enter investment sales in the Wages and Income section of TurboTax, then Investment Income, then Stocks, cryptocurrency, Mutual Funds, Bonds, etc... Skip the section where it asks if you want to upload your tax documents. Choose Stock, Bonds, Mutual Funds as the type of investment you want to enter. You'll come to a screen where you can enter in your sales proceeds and cost basis.
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