Why not use Amazon Lockers [1]?
It's actually sad that it's amazon specific. I'd love to see this rather implemented for the post services like USPS/UPS. In Germany, we have DHL Packstation and you can just have it shipped to those location and pick up your package 24/7. It started getting a bunch of locations in 2004 and nowadays they have them every ~300-500m around big towns (like Munich for instance).
[1] http://www.amazon.com/gp/feature.html/ref=locker_hp_fd?docId...