Take a deep breath, take a moment to quickly clean/de-clutter, lights, etc and leave. I know this may be an inconvenience but Buyers always want to figure out how they can fit their stuff in your house or discuss what they would change and they will not do so if you are there. If we have time frames to work around due to children or day sleeper schedules, I will outline those requirements in the listing and set time parameters on the keybox.