That's why you can't find old LV mileposts or whistle signs. The tubing could be bent over, it would crimp flat where bent, and then could be bent back and forth until it broke off. I figured that one out when I noticed the base to a whistle post near Kendaia in Conrail days and later noticed an oddly short LV whistle sign in someone's front yard. I think the only way to find one now would be to do some serious tresspassing to find one that was well away from anyplace it would be easy to get to by the average person - you might literally have to hike several miles.
It's been too long since I was in Athens, but there was like a 6-track signal bridge with nothing on it across down below where the line curves kind of westward to cut across town, I have some pictures with it in. I suppose it could have been scrapped by now, but I never heard about it being done. Below Milan there used to be a lineside mast or two, with heads turned aside and no guts.
I'd like to know who got their hands on the signal heads that were at Geneva Jct. in 1993 - some of them were just laying on the ground there. I can't imagine Conrail having picked them up for anything - by the time I thought I should pick one up, they were gone. The tower foundation is still there, too, and had some odds and ends of relay parts in it last time I was there.