Ok, was at dealer today and they want the car back on Monday morning, they are going to pull the wheels and take pictures.
They agree that since these "chunks" are random and only on three of the four wheels they will document and send to Ford.
I would not be concerned if all four wheels had the same, but one wheel has none, and the three others have different number and sizes of these "chunks".
I know they are cast wheels, but they should all look the same, with the same markings.
If they are drain holes, then I'd still have an issue as one wheel doesn't have it.