Hey Sparky…
Just wondering if the same quarter is used in all the product shots. As there could be some size variation due to die wear and process variations, the actual device size might vary by as much as two thousandths of an inch! If not, I hope the quarter being used is properly calibrated to the standard diameter,and temperature/ humidity is carefully controlled. 
P.S. What state?
It was the same quarter for many months. Then I think our Roomba ate it.