Could it be a hoax?......................
Maybe it hit branches that slowed its fall?
Or maybe it hit soft ground.
Everything has a terminal velocity and the terminal velocity of this phone may be sufficiently slow that it didn’t provide enough force to break the phone.
Everyone has been focused on the supposed survival of the phone, not the infinitely more bizarre luck of someone happening upon it.
And so soon after the incident.
Maybe it’s legit, but that was a red flag for me. That and the screen being open to the AA message.
An iPhone without a CASE is just pre-cracked waiting to be post-cracked. Bad cases will permit corner cracking if the fall is from high enough, and face down on a sharp or hard pointed or elevated object, not a flat surface like the floor will crack the screen. Look at the depth of the raised side of your case to get an idea of its ability to protect the phone if it hits face down. The lower the ridge, the less protection.