My thoughts exactly, "don't make sense" but "does make cents"
I don't think I had all of those questions, but am suspecting that they were building a database on you to understand where everything is in case they needed to help you, in the unlikely event you did not know something.
Also, when I had DirecTV here not long ago, DirecTV wanted to know where each receiver was so that they could disable the correct receiver when they sent you out a replacement. You would not have to give them the serial number or any of the other numbers associated with the box.
EDIT: Easier to say the receiver in the Living Room, Bedroom 1, Bedroom 2, Barn, or maybe at the neighbors house.