Hi,
Here is a link which shows how to open a remote control. It really starts showing at about 2:00 minutes into the video. I have found that the wider the blade of the implement used to open the case the easier it is to open and the less damage is caused. Screwdrivers can cause a lot of cosmetic damage. I use a 1" paint scraper to great effect.
https://www.youtube.com/watch?v=xvJWqf_b6Eo