Bank Owned - They dont know

I have found a property that I believe, the bank doesn't know they own. It was foreclosed on in 2010, listed for auction in 2011, but is still owned by the bank. The taxes are 10 years delinquent and the county just slapped a right to sell notice on the tax bill. The county only does auctions once a year, in October, so there is another year before this thing hits the auction block. What would be the best way to get this property? Wait till next year, call the bank and tell them they own it? This is a California Property, so I can not buy the tax lien.