While I was under the Jeep fixing a leak tonight I noticed the nut on the driver side motor mount had shifted. Didn't think it should be moving around so I checked the one on the passenger and saw that the nut was gone. I remembered I found this lost little nut months ago so I went to check it out. Not only did it fit, but I have this feeling it might very well be the nut I was looking for. Before I put it on I looked closer at the bolt sticking down and noticed that the bolt itself was working it's way into the metal. I put the nut on anyways for now since I gotta drive to work tomorrow.
My question is could this lead to a problem? I don't think the engine shifting a few millimeters is much to worry about, but I've gone bouncing around some trails (without that nut) since then and am worried if there might be damage that I have yet to find.