Whats the best way of sealing the cardboard box?
A. Always tape the opening of your box and reinforce all seams with a stampable reinforced packing tape or paper tape that is designed for shipping; your friendly Post Office associate can be of assistance in this matter. Do not use masking or cellophane tape, cord, string or twine. Various office supply outlets (in addition to Post Offices) carry Post Office-approved packaging materials.