Many laptops are built on a common chassis .... cud be an HD bay, cud be an optical bay ..... did you order an optical ? Do you see one in Explorer / Device manager ?
It looks like there is a tray to open. no eject button that I can see.
C55-B5202 does not come with an optical drive, but it has a plastic "plug" that looks like one. This is a shared chassis with models that do come with a drive, so the "plug" is there to facilitate the addition of a drive on those models.