A similar sentiment to other commenters in this thread... Why re-invent something incredibly resource-consuming like building specialized tube boxes?

If I were to invest into something today it would be medium size (about a tall van size) autonomous containers that can drive at night within city limits and drop off small reusable containers at delivery points such as apartment buildings. Case in point: Luxer One is a fairly common setup in SF today, the next step would be to stop delivering individual packages and, instead, deliver daily boxes for the whole building.