Nice grab. I haven't found one yet either. But people hunting nickel rolls seem to have better luck than I would have thought, even if it is a more targeted search.
Never in a Coinstar but, ironically enough, I found my first ever (1944 P "silver" war nickel) this past July. Been detecting since the early 1980's but that was my first.
Last year (I think) I found a war nickel and a steel penny together in a coinstar. I am guessing someone put their parents' or grandparents' coins through the machine. Those are both the only ones of those types I have found.