How to open external I/O Magic USB 2.0 CDRW case?

Picked up a 52x24x52x I/O Magic External USB 2.0 CDRW that uses a Benq drive.
Planned on removing Benq and installing either a LiteOn or a hard drive in the case.

What’s the secret on getting this case open?
Have removed the 4 visible bottom screws, plus the one screw hidden under the void if removed sticker,
but the plastic/rubber housing still won’t come off the drive.

Any advice is appreciated.