The tough economy has forced Americans to return $47 billion worth of Christmas presents. That’s up $7 billion compared to last year. Some are using these returns to find great deals and turn their own finances around using a warehouse in Plainfield. In Plainfield, a warehouse is full of giant flat screen televisions, digital cameras, Guitar Heroes and iPods. “Many of them are customer returns,” said Cayce Roy, Liquidation.com asset recovery.