I've been following this thread for a while but had nothing to contribute until now. I know there was a small lynch mob formed because of a supposed sighting of Intamin track on I-71, but I have something to report.
I'm not going to say for sure that I saw coaster supports on I-275 (just past the Coney Island exit and before the Highway 52 exit), but I think I did. There were two trucks pulled over on the side of the road, each with about half a dozen long cylindrical support-looking objects on them. The "supports" were silver...shiny silver, not gray. A couple of them had smaller cylinders branching off of the main post. I'm not an expert in coaster supports, but that is what they looked like to me. Since they were pulled over, I didn't realize what they were until after I had already passed them and I was on my way to work, otherwise I would have tried to get a picture. I work in Clermont County, but it seems like the trucks would have had to have come from Kentucky or Kellogg Avenue by the way they were facing.
So, if this turns out to be nothing...don't hunt me down and beat me. But if it does turn out to be something, I just wanted to put it out there that I saw them.