Related Clues:

• 500 sheets of paper
• Print shop unit
• Stationery order, perhaps
• Swindle, in slang
• Packet of paper
• Scold, with "out"
• Paper amount
• Office manager's purchase
• 500-sheet paper unit
• 516 sheets of paper
• Foolscap quantity
• Tear a new one
• Quantity of paper
• Photocopier tray capacity, maybe
• Stationer's quantity