Unfortunately, Trulia has an arrangement with a service called RealtyTrac that charges subscription fees to find out foreclosure information. Trulia shows those listins here, you click on to RealtyTrac and then have to pay the subscription to get more information.
Unfortunately once again, RealtyTrac is often VERY innaccurate and often very outdated. If you see a new foreclosure property pop up, it has probably just received a foreclosure notice. That means that it will still be at least a month before the home is actually foreclosed on. Then it has to go through multiple processes before it will be listed on the market. This process is often 3-6 months or more.
In addition to this, if the home is purchased at the foreclosure auction or the foreclosure is delayed because of a pending short sale or any other reason, RealtyTrac does NOT get that information so they don't update their data.
If you want foreclosure information, contact a local real estate agent. Don't depend on this website or RealtyTrac as they are not accurate at all.