You see this on quite a few houses in Bear Creek. The 1996 transactions are two years prior to the houses being built and would appear to have something to do with the land for the houses being bought/sold between developers.

If you like the area check out the recent sales price on this one. http://www.redfin.com/CA/Murrieta/37832-Sky-High-Dr-92562/home/6163052
Notice that this one also has the large sales price in 1996