Presumably you know your cost basis?
Cash liquidation distributions pretty much act like returns of capital: you reduce your basis on your own books and records. As long as you still have basis there's no reporting required. If a cash liquidation distribution exceeds your current basis then you report that as a sale using the "Stocks, Mutual Funds, Bonds, Other" interview and telling TurboTax you didn't get a 1099-B.
