In summer, I often hunt the Spruce and Aspen forests in the Rockies just below timberline...8,000 feet to maybe 11,000 feet and have found things like splitting wedges, chainsaw files, logging chains, broken pocket knives, and other items left or lost by logging crews and miners in the early 1900's.
In the forest the finds are few but I dig every target. Along the game trails in the timber, I have found shell casings, lead bullets, and even a few coins. I have learned that more finds turn up around remote camp sites (look for the rock fire rings) in the woods or near steams where hunters, miners, fishermen, and campers would have set up their tents. I'm sure when I find these sites that they have never been MD'ed.
I enjoy the deep forest and as I become a more 'experienced' MD'er, I find I don't want too many targets. This way I can say I dig every target when in the woods! Hmm...may take off this afternoon for another game trail I've never been on.