Hello,
I found this question while I was looking for an answer for the same drive you have a USB 3 GDRIVE mobile. I got mine open by using a couple of plastic knives from Wendys restaurant. I forced the tip of the knife between the edge and the bottom cover. Start on one of the long sides near the corner on the USB end of the drive case. Those two corners don't have catches and will be the easier to get it started opening. Once you get it started keep working your plastic knives around the sides working them loose. Really none of the corners have catches but the two on the USB end have a larger area without catches.
Hope this helps! You could use s spudger, but I have lots of plastic knives and I wanted to possible reuse the case it the circuit board is still good.
Enjoy!