Quote Originally Posted by tapasr_00 View Post
Good question I've been asking myself the past few days.

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To test if yours is sealing properly, hold the lid open about an inch and let it go suddenly. It should not just slam shut if the lid is sealing properly. Due to increased air pressure inside, the lid would slow and drop into place more gently than you would expect if it's sealing right. Also, if it's sealing properly you will hear a little hiss of air leaving under a bit of pressure.

Try that a couple times with yours. Does the lid just slam shut? If it does, and you're not hearing a hiss of air as it closes, then your humidor probably isn't sealing properly.