Epson EPL-N7000 - Manual (Page 228)

Installing Options 217
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6. Install the base unit of the 4-Bin Mailbox.
Make sure to align the metal pins located at both sides of the
unit to the matching holes on the printer. Then pull the unit
to the front so that it securely sits on top of the printer.
7. Secure the base unit with two screws at the back of the printer
by using the wrench that comes with the unit, as shown
below.