The last (that we know of) government Cyber was taken
out of service in
  2007.  Admittedly that was a 8x0 series and, if it had a card reader, I
  doubt it was a 415, but still, it was a real live Cyber running real
  apps...  (And, for that matter, NOS was maintained as late as 2000 --
  there was a Y2K patch for it.) 
Certainly there were a few Cybers still going in the early 2000s.
This "last" one - was it a shipboard installation? If so, do you know
which ship?
--
Will