What is the Black Plastic insert for the MHxxUTK trims for Nema 3R NQ and NF Series E1 Panelboards?

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Issue:
What is the ash tray looking black plastic piece used for the door latch for Nema 3R NQ and NF MHxxUTK trims?

Product:
NQ/NF Panelboards

Environment:
Installation

Cause:
Parts

Resolution:
The snap in Plastic Trim latch cover is part number 80103-403-01.
See instructions and picture below :
insert