If those little tiny dots I see are your ventilation holes, then you need bigger holes.
I just randomly looked through threads until I found a pic (video actually, as it turned out) where you can get an idea of how many & how large of holes are typical:
http://www.ball-pythons.net/forums/s...d.php?t=113529
67% really isn't bad humidity, so if you are getting that with those little tiny holes, you won't need to add very many larger ones. It all depends on the individual conditions, so it varies a little bit for everyone.
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