It is excellent to see that agents in Apple Valley are protecting the home owner by not revealing who they are or a means to contact them. All those 'investor school' escapees are also wanting the same information so they can hunt the owner down like a pack of dogs.
As a real estate agent with the address of the property you have many, many, many options. I suggest you consult your broker about using the tools readily available.
Don't expose your home sellers to unwanted exposure. Do exactly what you see these other agents doing.