I'm guessing the route you are training on is in town and the stops aren't spaced far apart. I would spend maybe a minute or two looking for the package. If you can't find it, drive to the next stop and when you open the bulkhead door and step in the package area the stop will be right in front of you. Almost guaranteed. That's happened to me so many times. Chances are though you will probably swing by the stop again in the afternoon during pickups. You didn't say what the route is like so I don't know. That's what I would do.
I agree with Dracula. That's good advice. I don't know any driver in my center who didn't do everything they could to make their 30 days. Just be careful and work smart and take a lot of deep breaths during the day.
Good luck