Same incident here in Louisiana. Nobody could tell me where the parish route markers were posted, as parishes "do not keep track of them," along with the DOTD holding no knowledge. I guess it's fair warning to say that if anyone wants a parish route marker, head to your nearest parish and grab one.
AHTD couldn't tell me if signs with the state name were being replaced or not. "AHTD knows nothing about the addition of state names to signs, and any signs erroneously posted in the open are in violation of MUTCD standards."
A few years back, I wrote AHTD asking the the state markers went from State XX Road to Arkansas XX and was told We quit making the cut-out type route marker signs sometime after 1971. The Manual on Uniform Traffic Control Devices was revised in 1971 and it changed the cut-out type route markers to a square or rectangular shape.
This was from the Assistant State Maintenance Engineer.
I'd love to get a tour of their shop and see if there are any hiding in the corner, but they probably ground them all up for scrap
Maybe we need a Roadmeet in Little Rock and can arrange for a tour of the sign shop.