WordNet (r) 3.0 (2006):

office boy
    n 1: a young man who is employed to do odd jobs in a business
         office

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "office boy":
   Ganymede, Hebe, airline hostess, airline stewardess, attendant,
   batman, bellboy, bellhop, bellman, bootblack, boots, cabin boy,
   caddie, callboy, caller, chore boy, copyboy, cupbearer, errand boy,
   errand girl, footboy, gofer, hostess, office girl, orderly, page,
   squire, steward, stewardess, tender, trainbearer, usher, yeoman