https://community.usa.canon.com/t5/Office-Printers/Model-MF8280CW-comes-with-a-plastic-part-labeled-FC9-4510-000/m-p/171386#M4283 Canon part name is dust cover. When you print using legal sized paper, the tray must be extended via a blue button labeled LGL just inside the tray. This will cause the paper tray to stick out. So after extending the tray and loading legal stock, you then can install the dust cover before sliding the tray back in. Arrows on the cover point toward the printer. Two pegs on the cover go in the two holes on the end of the tray. Basically sits on top while you slide the tray back in. Thu, 28 Apr 2016 15:19:00 GMT SkinnyB 2016-04-28T15:19:00Z https://community.usa.canon.com/t5/Office-Printers/Model-MF8280CW-comes-with-a-plastic-part-labeled-FC9-4510-000/m-p/168630#M4176 <P>Model MF8280CW, comes with a plastic part labeled FC9-4510-000. Anyone knows how to install it?</P> Mon, 28 Mar 2016 14:54:38 GMT https://community.usa.canon.com/t5/Office-Printers/Model-MF8280CW-comes-with-a-plastic-part-labeled-FC9-4510-000/m-p/168630#M4176 El_Tipo007 2016-03-28T14:54:38Z https://community.usa.canon.com/t5/Office-Printers/Model-MF8280CW-comes-with-a-plastic-part-labeled-FC9-4510-000/m-p/171386#M4283 Canon part name is dust cover. When you print using legal sized paper, the tray must be extended via a blue button labeled LGL just inside the tray. This will cause the paper tray to stick out. So after extending the tray and loading legal stock, you then can install the dust cover before sliding the tray back in. Arrows on the cover point toward the printer. Two pegs on the cover go in the two holes on the end of the tray. Basically sits on top while you slide the tray back in. Thu, 28 Apr 2016 15:19:00 GMT https://community.usa.canon.com/t5/Office-Printers/Model-MF8280CW-comes-with-a-plastic-part-labeled-FC9-4510-000/m-p/171386#M4283 SkinnyB 2016-04-28T15:19:00Z