Those t5000 vibration dampener "danglers" usually broke off and its pretty rare to find one today that is intact. Below picture shows t2000 .. t5000If you manage to remove the dome without destroying the grip, you would find a small block of tungsten that had broken away from its tether. I think most of the used T4000s became maracas at some point. This is why the T5000 went with the rubbery dangler instead, which was only marginally more resilient.
"Pretty rare"; I'd say extremely rare - approaching unicorn status! I've seen many more Hi Tens, Equijets and Dynaspots for sale than I've seen T-5000s with vibration dampers intact.