In order to reduce our carbon footprint, we've redesigned our product packaging to become more plastic-free. For the Apple Watch Series 7/8 or Galaxy Watch4/5 you may notice that the InvisibleShield can be a bit tricky to find but, trust us, it's in there.
Simply pull the red tab and open the flap in the top portion. It will be found under that flap. A couple of pictures are below: