An asset at zero does not have a positive value. It has literally 'no value' it ceases to be an 'asset'.
Please give me a list of assets at zero.
Let's say a car has a scrap value of $25.00. If the bank repossesses it because of an outstanding loan balance of $100.00, the cars value is, you guessed it, $25.00 to the scrap dealer (seeing that he's willing to spend $25.00 for it), and $-75.00 to the bank.