The Fourth R by George O. Smith

Jimmy had less scout work to do and no school to attend; he was too small to help in the sorting of car parts and too valuable to be tossed out. He was in the way.

So he was in Jake's office when the mail came. He brought the bundle to Jake's desk and sat on a box, sorting the circulars and catalogs from the first class. Halfway down the pile was a long envelope addressed to _Jimmy James_.