Yea same thing happen to me. Some one stole my shee and blew it up then took it to a shop to be fixed, which is where i recovered it. Did this in one week
lol At least you got it back. Yea so somebodies been raping your motor for sure. go head and pull the cylinders and see if that missing rod damaged anything else when it let go. If not then you're just going to have to get another crank and pistons, along with a bore and hone. So how did you end up finding it?