It doesn't hurt to keep an eye on them, but mold spores are basically everywhere in the air naturally already, so the easiest way to inhibit their growth is to keep the moisture down below the level at which they can grow, so if that box of cigars were mine, I'd leave both it (lid open) and the cigars out of the humidor for a day or so, then see how moist they are, if they still seem very moist, then a bit longer. Then make sure my humidor is operating at 65%RH or less, and put them in.
