I see no harm in lightly wiping the inside of a new humidor with a moist sponge, towel etc. because if for nothing else, you are removing the dust/micro wood particles etc. The wood is not going to swell if it's not soaked, and IMO wiping down the inside does help speed up the seasoning process.
Agreed. Sometimes I just take it out back and run a waterhose over it for a few minutes.