Ключевые слова: abstract, address, apartment, background, bills, box, building, business, communication, condominium, delivery, dormitory, envelope, filled, home, house, key, keyhole, letter, letterbox, lock, locker, mail, mailbox, message, metal, modern, multiple, new, newspaper, notice, number, office, parcel, post, postal, postbox, privacy, reception, residential, room, row, safe, safety, security, service, shelf, storage, stuff, wall,