Not saying its correct but sometimes you have to read between the lines
It’s possible that buyer placed order and was hoping for delivery on 1st EDD
They got a ping on their phone saying item has been delivered but as you said- it was at reception so they may not have had it until checking at reception desk later
It may have arrived day after they needed it so contacted amazon to see what their options were
You said they haven’t opened an a-z or left a review or feedback so not sure what you are actually reporting them for at this point ?!