I just went to Amazon's locker search and plugged in the zip code for the state capitol and the Jackson, MS city hall (largest city in MS) - no results for eith

I just went to Amazon's locker search and plugged in the zip code for the state capitol and the Jackson, MS city hall (largest city in MS) - no results for either. I wonder why they're ignoring the state? We've got lockers in the semi-rural part of Pennsylvania I live in.