On the 'Courier Work' page?
There doesn't seem to be any rhyme or reason to it. It's not in order of posting, because the job at the top was posted days ago. It's not in order of pick up time either, you can clearly see it isn't.
May I suggest the jobs are listed in order of post time, that way any new jobs appear at the top so we can all see that they are new jobs and may require our attention?