No ... ANY humidor should be charged before using it ... the reason is, that the wood itself will absorb moisture from the humidifier ... not only will the wood take what it needs before the cigars get any, it will take the moisture FROM the cigars themselves ...
Wiping the inside of the box with a clean sponge that has been dampened with distilled water (or adding a container of steaming water to the box) are shortcut methods of charging the unit ... your best course of action is to put an open container of distilled water into the box and let it sit undisturbed for at least a week ... the wood will be able to slowly absorb all the moisture it needs to become fully charged and function properly ...