Found this pic on FLIKR- There is a diamond-shaped stop sign visable in this stash.
http://www.flickr.com/photos/mblazing/2043904540/ (http://www.flickr.com/photos/mblazing/2043904540/)
It's likely not an actual stop sign, but meant more in the sense of "Stop Ahead".
Kinda like how Oregon doesn't always put every word on its signs...(i.e. "Speed" as opposed to "Speed Limit", "Rocks" as opposed to "Fallen/Falling Rocks", etc.)
Someone could get rich reappropriating those signs - a couple thousand dollars lying around.
Yeah-obviosly they don't realize the value of those. Somebody needs to make the owner an offer.
That's an old style stop sign. Wait, they weren't diamond shaped though. WTF?"? :-/