Even though TurboTax states "We'll handle you cash liquidation distribution of [DOLLARS] from [PAYEE] later " and "Just remember to go to the Investment Income section under Income & Expenses", all of which suggests that you're going to find that amount already entered when you go to that section, it really doesn't. It's all up to you to figure this out.
IF the Box 8 amount is more than your basis in the investment THEN you have a reportable "sale". Using the "Stocks, Mutual Funds, Bonds, Other" interview and telling TurboTax "I'll type it in myself" and that no 1099-B was received, use the Box 8 amount as the "proceeds" of a sale, subtracting your remaining basis.
Tom Young