When I'm aging boxes, I keep them intact, exactly how they came, except for the times I open them for inspection. After doing that inspection, if the cigars appear to be dry, I open the box top to allow for air circulation, so the box and cigars to regain their integrity and moisture quicker. It will take much longer to rehumidify the cigars if the box is closed. If the cigars are really dry, it could take weeks or months for the humidity to rehydrate the box and seep inside to the cigars, where it has to then raise the humidity of the cigars themselves. But if you plan on sitting on a box for 2 years, not necessary. If you want to smoke from the box soon, crack the lid open.