How many of us read all the details before we sign a document? Few of us read software agreements and blithely click "Agree". Sales people often say it is a standard contract as they wish we would stop reading and sign the damn document.
We are having our shaker porch rebuilt, and Wednesday a local lumber company delivered the materials the carpenter ordered. The delivery guy stacked the dimension lumber all nicely in our back yard and I signed the order form.
Later I looked out and there was a new pile of cedar shakes. I looked at the form and saw that the shakes were listed. Probably the delivery guy saw the mistake after another delivery and came back.
There are honest people in the world, lots of them.