I only open 'bout 30% of my kits, as I'm not goin' to build 'em all anyway, and a sealed kit is easier to sell, trade, or donate. When I do open a kit, I cut an X on the bottom of the box from corner to corner, open the box, and then fold over the triangles of shrink wrap into the cover and tape them. On the shelf, the open kits looked sealed and don't have edges along the bottom that can be snagged or ripped.