" foods in the deliveries would include shelf-stable milk, juice, grains, cereals, pasta, peanut butter, beans, and canned meat, fruits and vegetables, "
Shipping individual boxes is crazy, pretty sure that's not what they're thinking. Just USPS parcel post a big box once a month, probably going to be like $10. As they mentioned, they already did the study, and with the delivery method they have in mind, it'll half the cost. The fact that if they use an existing government postal service for the delivery is almost like taking money from one pocket and putting it in another. Volume may be higher, which is what the post office wants, and the postal workers will be running the same routes regardless of boxes dropped off at more houses.