The gesture was sweet
This delivery person wanted to make sure that the package was safe from thieves, as it’s terrible when deliveries are stolen from people’s front porches. They got creative and wedged the box in the roof of the balcony, thinking it would be hidden and secure there.
It would have been a sweetness had they not placed an obvious note that says “look up.” The fact that it was hidden is now moot since anyone can read and follow the instruction of the note.