Why so much checking?
There are two reasons for meticulous preparation of all the equipment and stores you will need for a shoot.
The first is clearly your own professional pride and the need to pack equipment in such a way that the crew can find any piece of equipment quickly and efficiently, even in the dark of a night shoot. Also, it is essential that all the equipment starts the job in the finest possible condition.
The second reason, and indeed the reason for some of the more obscure test procedures, is that the production company probably raised a completion bond to insure the picture gets finished and the bond company will require hard evidence that all was well before you started.
A completion bond is a form of insurance taken ...