[muawiyah]

Trays, sacks and other containers run out in places where huge volumes of mail are generated for nationwide delivery.

Trays, sacks and other containers pile up in places where huge volumes of mail are received for delivery from mailers elsewhere.

New Jersey "manufactures mail". Florida "consumes mail". In a similar manner, Florida grows oranges. New Jersey eats oranges.

Empty equipment (sacks, trays, and other containers) are shipped from Florida to New Jersey on a regular basis.

Say, you aren't with the FBI are you?

[oceanview]

no, I am not with the FBI.

OK, so this mail processing equipment is what flows with the mail itself, I thought it was part of the permanent infrastructure - boses, post offices, etc.

they loaded the letters outdoors? sure, anything is possible I guess.