I really don't know if a peace fork counts as a signature item but most of my caches are peaceforks I am up to peacefork 28. A peace fork is a plastic fork (The kind you get at fast food resturants) that are heated with a lighter and two of the fingers are bent down so the fork looks like a hand making a peace sign. If you are in the Bowling Green Ky area try to find one. They are everywhere.
When I started with all this geo madness I was a little shy about signing logs, don't ask me why. After about five or six I got over it. I have why problem signing them now. I say he is not finding them, There is no reason not to sign a log.