Back when I used to browse eBay a lot more often, I came across a listing for a Fury III that was claimed to be a former Sheriff's car. It was definitely a Fury III, showed signs of having shields and other markings on it, and may have even been a 4-door hardtop (not a sedan!). I just did a Google search to see if there were any images and came across this on the Washington State Archives' Twitter. Only one car in the pic is fully marked and kitted out, but the ones behind it are also clearly Fury III's with spotlights mounted and black wheels--which, in 1970, still meant full wheel covers. I was able to zoom in just enough to make out a 440 badge on the hood blister.

https://twitter.com/WAStateArchives/status/1230242415769837568/photo/2