imagestablization

Thanks for any help anyone can provide on what I know is a fairly obscure question. Canon USA support has been unable to provide guidance. The Canon EF 500mm IS L II appears to have a feature in its image stabilization algorithm that detects when the lens is mounted to a tripod or otherwise...

I just got a semi used RF 70-200 2.8 len from guy in jersey city union city nj area today for less then 2300 and I noticed when I got home the lens rattles/wobbles a little nothing severe YET, but is that NORMAL? and like how the R5 shakes when its off and etc are these shakes/rattles/wobbles...