Corners set not by original

How do you treat corners that been set about 30 years after the signed survey and not by the original surveyor but by the original company? Recently I survey a tract of land owned by the city, adjoining a city road by one side and a highway on another side. The city and the DOT both completed right-of-way maps and bought right-of-way tracts about 50 years ago. The street and highway already built and maintained many times over, and of course there are none of the corners from the original surveys are found.

 The corners found for the right-of-way are new, set by the city 2 years ago, and by the DOT just last month or so.

   On the 2012 map, the city surveyor just show every corners are set, and not a found corner, I have no idea where he based his survey on.

  The highway re-tracement survey map, and the surveyor tried to prorate all the distances (half a mile or so) between these found corners to re-set the old corners. Anyway, some of these set distances came out ridiculous, like two corners set 29.98 feet apart (original map call distance 30 feet), or 150.89 feet (151 feet) *face palm*, this error adding up and made a 0.5' different b/w the set and the call distance.

Problem is, even if I disagree with the new corners set by the city that adjoins the city street, can I still hold their corners? Since the tract and the road both are owned by the city, and they set their own corners for the right-of-way line (recently), then that would constitute that how much they give up the land for right-of-way? I do hate to set a private company rod next to a city rod, and call it the right-of-way, it just going to create confusion for everybody else.

Then on the highway rods, even if I hold the new rods, do I show the new distances as set by the new surveyor (29.98') or keep the call distance (30') since that was what on the deed?