Although ZIP codes were enumerated based on regional sorting facilities, geographic boundaries do not technically exist.
ZIP codes were only first introduced in the 1960s with the introduction of new automated address reading machines.
As a map user, this might shock you, but there is NO OFFICIAL MAP of ZIP code boundaries!
Food industry employees are notoriously underpaid. Service workers who receive tips are often paid below the minimum wage, with the expectation that the difference will be made up in tips.