Well, there's 1,000 ft of Cat6 riser-grade cable in a box. At 1.59 lbs/1k ft (23 AWG, solid), that's 12.72 lbs (8 conductors) of copper in the box.
Bare bright copper is worth about $2.90/lb at the scrap yard, so there's about $36.89 worth of copper in that $150 box of cable (24.6%).
For...