Inside Liquidity Services and the $644 billion liquidation market fueled by the rise in returns

CNBC takes you on an exclusive tour inside a Liquidity Services returns warehouse outside Dallas, Texas, where unwanted goods from Amazon and Target are stacked to the ceiling. A record number of online returns has created a booming $644 billion liquidation market, which means big business for the nation's only major public liquidator, which also refurbishes highly sought after electronics amid a shortage of new goods.