Doc,
If there are nuts in good abundance, there must be nut yielding plants in the area then, no?
Not necessarily, it could be seeds as suggested by B5 in his OP.
Otherwise they were transported. Animals would have stored them somewhere in a cluster however at this time of year...
Here,
C. cornuta is an understory plant in our coastal temperate rainforests of Pine, Fir, Cedar, Madrone, Sequoia, Hazel, etc. It loves the moist forests.
Medium shrub-small tree in size, it blends in very well, is lightly leafed and sparsely branched and easy to see through... I've scanned over it countless times. Of course, I could be wrong!
I would say go back to the spot and examine the area again. If they are edible, you've got a good little harvest area!