Yes, that's exactly the sort of box. We didn't use any setting pins, although sometimes the occasional specimen would need a micropin against a wing margin to stop it moving. Usually the pressure of the wings on the plastazote was enough to stop them from moving once they had been opened out with a setting needle. After filling a proportion of the box we would draw a line around the edge of the specimens and include a single temporary data label for all of them.
It is worth noting that micropins are VERY dangerous and should be handled with care. If you drop them on the floor and someone treads on them the pins are so thin they might not even notice, and they can work their way deep inside someone's body.