You are in California and should know, that most sales agents are scared to death of not disclosing significant defects - the type agents often get sued for not disclosing, such as windows that leak during heavy rains. However, some defects are just aesthetic and minor. They also run into problems from potential buyers if the the MLS photos do not show realistic colors are are touched up. So most competent Real Estate Photographers are in the habit of taking all photographs under pure white flash light.
-- There is very real danger here. I like to think of the owner-builder who never got through final inspection because he had put 14-gauge wire in the kitchen, where 12-guage is required. That is a safety violation --- a fire hazard. - You could probably discover this just by pulling some receptacle cover to look at the wiring.