@Ruth459
no, they don't have to be in Iraq right now, it just means their SIM card / mobile service provider is in Iraq 🙂
There is nothing more you can do just be reachable by phone or Airbnb messaging system , they will contact you when they find themselves in front of the closed door. Of course it doesn't mean you have to be awake and wait for them after your bed time, if they don't arrive a few hours after your check in time window then just turn off you phone and go to sleep.
I hate when they do this, what are they thinking? Airbnb is not a hotel with 24 h consiarge service ... they should book a place with self check in option if they didn't know when will arrive.