score:5
From my discussion with an export certification clerk it appears that only consumables have to be unopened. Durable goods like laptops or clothes have to be presented in the original package, undamaged, and in case of a set all items have to be present (e.g. a laptop sold with a charger and a dock station).
In the case above, the laptop in question was used for a couple of weeks, then put back in its original package (box). The box was then carefully closed, but it was still obvious that the original adhesive film was cut. The export certification went smoothly.