Good advice. I might consider allowing a licensed, bonded inspector into my property when I wasn't there - IF the inspector had an established reputation and local references - but I would never allow anyone else - potential buyers and their kids and friends - in the house unless I was there, or a trusted realtor known to me personally.

As to a smartphone-enabled lockbox - no, not ever. Not a snowball's chance in Hades would I ever allow that. If a seller does not live at the property, or the realtor prefers that the seller not be present when the house is shown, there must be a very clear agreement about who has access and when. And a lockbox with a strictly controlled key or combination access is essential.