So you can dismiss someone's job because you, a person whose job it is to look at wagons, got an email you didn't see the point of?
If they have the sheet, why do they need you to work there and look at the wagon at all?
Now, I know your job definitely has more to it than looking at wagons and confirming their existence.
My point is that the person who sent the email does too. It's rare for a job to actually have no point and no work associated with it.