House still empty after Trustee's Sale

[Tyson Cross]

So tonight, I finally researched an empty house near me that has been vacant for over a year. In doing so, I see that the notice of default was filed on 8/15/2012, the notice of trustee's sale on 1/4/2013 and the trustee's sale occurred on 1/23/2013. Given the house's current condition, I'm assuming no one bought the house. I also noticed that the outstanding loan amount is pretty high ($800,000). I am very curious to follow up on this and see if there is any opportunity here, what would be the next step? If nobody bought the house at the auction, does the bank still own it and if so, what are they doing with it?

Is there a way to locate houses that do not sell at trustee sales? There is another house close by that was just foreclosed on and supposedly offered a trustee sale. This house still looks vacant as well. I would love to know what direction to take this and any help is much appreciated!