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Answer:  Same reason people carve their names on rock ledges and in the bark of trees...people are morons....

I'll vote for this explanation ;D
Still we've had discussions about people taking items that others left/cached for whatever reason. Maybe whoever took those items was carrying that to the extreme or even worse they saw an opportunity and took it.

You would think something as obvious as a portage yoke/shoes would be left but then again how many times have you heard people say " Finders keepers, losers weepers" in regard to others property. :(