Just took one of these apart. It's not too bad to open, there is an easily found youtube video that should you how to open one up. I got the case cleanly open using a paint scraper and plastic card to lever the tabs.
However, the inside metal shroud/case is attached by screws which are in turn covered by rubber pads which are glued/sticky taped on. This part wasn't shown on the video unfortunately. So, even if you could get the case off without breaking any tabs, unless you can seamlessly replace the glue/sticky pad, it is going to leave a tell-tale sign that the drive has been removed.