Static charge builds up on the person as a result of walking across the carpet. It does not build up on the equipment.
The equipment merely provides a current path to ground for discharging the static from the body.
Therefore walking across the floor can build up a static electric charge, then touching the paper box or the easel could discharge the energy. The static electricity path may or may not cross the photographic paper. Hence my comment about the grounding pads.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.
Static can be a real bugger to eliminate. We had problems in the lab where we mount images onto acrylic sheets. Acrylic can hold a significant charge, as can other parts of the equipment. Grounding is obviously a first step, but will not prevent static build up which is enough to suck in some debris. If you're already having issues with static, it's probably not advisable to add that surface directly against the carpet.