Answer:
How did it happen?
Step-by-step explanation:
According to the given passage, it is described that Ortega saw a leather briefcase lying in the back of the alley that looked out of place so he believed it was accidentally dropped and opened it to try and identify an owner but found cash inside.
Therefore, the question that is most likely answered in the excerpt is "how did it happen?" because the events leading up to it are explained.