You are very lucky my friend! As a teenager, I had someone attempt to steal the rears off my Triumph 2500s one night, and the first I knew about it was when I was going around a corner, heard a rattle & a thump, and the left rear bounced past the car and flew down into a gully! Mine unfortunately exited from the rear & punched the floor of the boot in. Count yourself lucky, go & get an alignment check and have your mechanic look for anything that is obviously bent, or areas on arms & bodywork underneath where paint is missing, or distressed. Then go and buy a set of lock nuts.