You can get 7 items (max) while rummaging. A household with a net worth of 30,000 will be considered to have a "medium" net worth. Likewise, a household with a net worth of 95,000 will be considered to have a "high" net worth. You'll have a 20% chance to pull a medium value item from a medium net worth household, a 30% chance to pull a medium value item from a high net worth household, and a 3% chance to pull a high value item from a high net worth household. Ignoring net worth, there's a flat out 15% chance to get a flop quality book, insect, rock, gem, metal or plant. When rummaging, you can get scrap. If you rummage in a cheap net worth household ( < 30,000 ) then you can get 10 scrap, medium = 20 scrap and high = 50 scrap.
That's enough net worth for now.