An electronic lock box system that includes a central computer, which allows “listing agents” (if used in a real estate sales environment) to custom tailor a survey questionnaire that relates to features connected with the potential sale or lease of a property, and thereby garner feedback information from potential buyers (or lessees), or at least from “showing agents” that represent potential buyers/lessees. To improve response rate, the listing agent can add incentives to other agents who provide useful feedback. Furthermore, the system can be configured such that reciprocal feedback is necessary in order for a participating agent to see feedback about his or her own listings.