Possible Clues:

• Diner stack
• Tags on a truck
• Behind time in the postscript, and that's flat for them
• They're on the table
• Some chinaware
• Stack in a kitchen cabinet
• Of late they came in the postscript, and that's flat
• On the table or in the mouth
• Staple for food containers
• So to be dead in a postscript may be smashing