The specific house (*7885 Sierra Drive) you are asking about has NEVER** been listed on the MLS. Perhaps you did not read the paragraph that Realty Trac wrote explaining why they posted the teaser ad about this property.
If you would like to approach the owners about making an off market sale, you may do so. I advise differently.
If the owners of the house become motivated by financial distress to sell their house, they will find a real estate agent and list it for sale. It is often a waste of time for a consumer to pursue unlisted properties that are not for sale, even those in distress.
On the other hand there are ten active listings and one short sale listing that are less than a mile away in Granite Bay that are for sale.
Expand your search to a 3 mile radius, you will find 7 times as many listings.
** Not listed for sale during the 21st century, It may have been listed for sale more than ten years ago. The records don't go back much farther.