Canon Color ImageRunner C3380 Reference Manual page 386

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Finisher-Y1/Saddle Finisher-Y2/Puncher Unit-M1 (Optional)
Gently push the staple case into the stapler unit, until it is
securely in place.
Close the front cover of the finisher.
The Optional Saddle Finisher-Y2
CAUTION
When closing the front cover of the finisher, be careful not to get your
fingers caught, as this may result in personal injury.
NOTE
If there are no staples ready for stapling after the cover is closed, the stapler unit
automatically performs a "dry" stapling operation to reposition the staples.
The Optional Finisher-Y1