In my experience, the power company enforces the grounding of the neutral at the building as part of their pre-energization tests, even when there is no other AHJ. In the un-inspected areas I have experienced, the PoCo lineman will make sure the neutral is bonded to ground before he runs the service lateral. . .anything else may well be ignored, but not that. I take that as evidence that the PoCo is all for the neutral ground bond even when it cross neutrals different systems.
Al
