Their employer is the U.S. Postal Service, but a few unlucky Bay Area letter carriers were hired only to find out their job is actually delivering groceries for online retailer Amazon at 4 a.m.

It’s an experimental program being staffed with City Carrier Assistants—the lowest tier of union letter carriers, permatemps who make $15-17 an hour. To find their way in the dark they’re issued miner-style headlamps

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