Al,
I cannot say that I have. Based on physiology you would think that the persons sympathetic nervous system would, over time, become more dominant. However, it's also not quite as simple as that. When the body is stressed the sympathetic nervous system kicks in, which would lower someone's HRV. But, if the body is stressed even further the pendulum swings hard to the other side.
For example, my HRV is normally in the low 60s, if my training load increases it hovers around the high 50s. When I begin to overreach, or get sick, it jumps to the high 60s. That's when I know I really need to dial it back.
So, if you get someone who has been training with a very high intensity and not recovering properly it's entirely possible that they're always in the red and thus have a high HRV, but not for a good reason.
I'm sure that's mostly review for you, but I don't have any case studies to present, so it's all I've got for you.
I've only really started using HRV in the last couple months, before that I just used resting heart rate, which is an okay proxy, but definitely less sensitive.