You should mark the Cost/Basis not reported on all of the sales you are reporting from the 1099-K. EBay would not have had that information to send to the IRS; you manually entered the cost basis when you entered the transactions. It is possible that an update happened last night, but it is normal to get the screen you see now after you confirm the values.
Box F transactions are long-term transactions (items you had for over 1 year) for which you didn't receive a Form 1099-B - you received a 1099-K, so you are providing the IRS with the cost basis.
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