This seems to be a good solution: https://en.wikipedia.org/wiki/London_Post_Office_Railway https://en.wikipedia.org/wiki/London_Post_Office_Railway Just have

This seems to be a good solution: https://en.wikipedia.org/wiki/London_Post_Office_Railway https://en.wikipedia.org/wiki/London_Post_Office_Railway Just have several store with more storage space where people can go pickup their items. Delivering box to individual homes cannot be efficient.