It is quite possible that they signed a contract that allowed the home to continue to be shown and even sold. The lease would simply transfer to the new owner. Don't know the specific requirements in Hawaii, but in the states I've lived/rented it, showing a place simply requires notifying the tenants with the appropriate amount of time. The tenant isn't usually required to not be home, but it's often preferred, by both the landlord and the tenant. I can easily imagine C & L not wanting to be home when the place was shown.
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The real question, though, is where are they tonight, if they checked out of the Mariott? They're gonna run out of high-end motels near the airport, sooner or later, lol.