Rather than start a new thread, it seemed better to post on this one as one of the routes mentioned is relevant.
Earlier this year, I discovered signage on what used to be OH533 just east of Bellefontaine. While the route is properly signed as Logan County 5, there is signage for "Old 533" in both directions. The route is only a couple miles in length and there are 2 signs for drivers heading north and 2 more for those driving south, as well at markers at the intersections with OH47 and OH540 at each end.
I don't believe it is appropriate to add this route back to the HB. I bring it up because it is better signed than many routes that are included. IMO, no action is needed other than perhaps a further discussion of how signage on a road vs. legal definition of a route can lead to different decisions on what should be included on this site. I know a related issue has been brought up on the I-676 in Philadelphia thread. Old OH533 is just more food for thought.