So I figured it out. Thanks to that video provided by @justicegoat I was reassured that this device could be opened safely without breaking it, i.e., no glue. I opened it up and noticed that the sensor was just loose and was no longer pointing to where it should be. Unfortunately the anti-stick strips couldn't be salvaged. It was easy to clip it back in place. I had dropped this mouse from my desk enough that it must've dislodged from its clipped home. Oops. Great mouse, though. See images.