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USPS employees still push carts with letters and packages around [0] and in NYC have master keys to many buildings' front doors so they can put packages inside.

[0] https://people.howstuffworks.com/when-postal-carrier-deliver...

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The packages were laying directly on the street.

Where else can they sort them?

Ten feet away, inside the apartment building?

NYC is not the most accessible city, and as such you'd have a hard time bringing a cart into many apartment buildings that have steps but don't have a ramp. Even if you manage to bring a cart to the front door of an apartment building, you'd still likely have to deal with a self-closing door which will fight you while trying to pull the cart through. Sorting inside the building is just not feasible.

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