Final answer:
Without context from the specific text mentioning Stagecoach Pass and the Greens, we cannot accurately determine the number of empty buildings at Stagecoach Pass when the Greens arrived.
Step-by-step explanation:
The question about 'How many empty buildings were at Stagecoach Pass when the Greens got there?' appears to be from a narrative context rather than a literal historical account. Therefore, without the specific text or story in which the Greens' arrival at Stagecoach Pass is described, it is not possible to provide an accurate number of the empty buildings they encountered. The provided passages do not contain any direct information regarding Stagecoach Pass or the Greens' experience with empty buildings.