Final answer:
The text does not reveal what was left on Zachary's doorstep; it discusses McTeague finding an unexpected packing-box outside his door.
Step-by-step explanation:
The provided text does not specify what was left on Zachary's doorstep; instead, it describes a scene where McTeague discovers a packing-box outside his door, which he brings into his room for further examination. The text suggests McTeague is puzzled by its presence, as he was not expecting any deliveries, indicating mystery and potential significance to the story's plot.
There is no direct connection between the item left on Zachary's doorstep and the excerpt given. The second passage is unrelated to the first and does not offer any additional information about the item left on Zachary's doorstep.