Yes, foreclosed homes can be toured.
It is best to contact a local San Jose real estate agent. Do not call the agent on the sign in the yard. In the overwhelming instances, the agents listing foreclosed homes have neither the time or inclination to respond to telephone calls. Get your own agent.
Bank owned, also commonly referred to as foreclosed homes, can be sold in many different ways. Some use the traditional real estate method and place the property on the MLS. Some will choose auction. Others may elect to use 'exclusive' resources of the organization selling the property. The bank or owner can choose whatever method they choose.
HOWEVER, the specific issue to which you refer is the nature of both Zillow and Trulia. There is lots of 'stuff' there that has no business being there, some stuff clearly incorrect, other stuff misleading and there is no one to hold responsible. If you want reliable data, you may need to ask for it. Your San Jose real estate agent will be able to connect you to the source of the REAL data you want.