Someone new? Or, they ran out of double sided tape? I don't know. I just checked all of my Obsidian sabers, including my newest one, and they all have double sided tape holding the board on. If you buy one in the store for a DIY install, it even comes with the tape already on it. So, that makes your SI a conundrum. Though, one of my sabers that was supposed to have a buck puck doesn't, so mistakes do happen.
I’m not saying one of us is wrong, US has different installers with different methods which is a reason why some colors look different from the next one.