Again, you can't sell deposits. Chase assumed the business of WaMu, which included liabilities - mostly deposits. Deposits are a liability and it is impossible to sell a liability. So saying "they sold their deposits to Chase for less than the amount of the deposits" is entirely inaccurate. It's somewhat counter-intuitive because deposits "seem" like assets and loans "seem" like liabilities - but it's actually the other way around on the balance sheet.