Qiao Mei did not expect the Song family to also have a hiding spot for treasures. She had thought that the Du family was the "cash cow" and certainly did not expect the Song family to be well-to-do too.
Actually, the Song family did not have much money back in the past, but they had kept all the items passed down from their ancestors in good condition. Back when Old Master Song was so poor that he could not afford to buy food, he remained firm and refused to sell away these items. Old Master Song felt that those things were a representation of the Song family's roots and that if they were sold, it would be the end of the Song family.
Apart from those items, there were also many gifts from the Du family and other people who wanted to curry favor with Song Dan. As Song Dan was a member of the police force, it was not appropriate for him to furnish his house with such luxurious items, so he kept everything in the Song family's old house in the countryside.