is there any other car in your garage it could be off of? typically for that part to come off, there would be some kind of a shaft hanging/dangling. I don't see that on your photos, and if there really was a shaft dangling, you would definitely know it. I've found some of those retainers on the trail, but I'm sure they were off SXS's. Your photos didn't indicate any grease being slung around. I just lost my CVC boot on the Transfer case end of my front drive shaft, and it definitely slings grease, thats how I found it. Its under warranty, so Jeep is replacing it, no charge. I will Immediately pull it and sell it, as it will just fail again, due to the angles from the lift. I'm thinking of going to a Adams 1350 front Driveline, but thats for another thread. Turn the stereo down, stick it in 4 low and mash that gas peddle to the floor while in the dirt or snow, and see what you hear. Finding parts is always alarming, but at this point I'm doubting it came off your JT. Good luck.