I would fill up 100 cheap old bags full of shredded newspaper and purposely "lose" it, meaning the winning buyer makes a grand profit of negative $700 to $1500.

But in all seriousness I definitely can see how this encourages carelessness. What really matters is that those responsible for loading the bags, contacting the owner etc all remain independent as to minimise the possibilty of corruption. And CCTV, of course.