This can be entered easily for 2024 in TurboTax Online. The purchase date should be selected as 'Something other than a date', then then select 'Various'. What's important is that you receive long term treatment on the proceeds. As far as the sales day you can enter any date in 2024, which is when these proceeds were settled.
It would seem you have used up all of your cost basis with the initial transactions in prior years. For this reason you should leave the purchase price blank. Continue to complete your sale and you should be able to proceed to complete your return.
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