What do I need to do to make this a Humi?

[BHalbrooks]

My Brother gave me a Pelican Case that's ****ing huge. Seriously.

Now it came with a piece of Foam, but that was it. It's airtight (Hence the clamps on the front), but it does have an automatic pressure release... That kinda makes me think it'd work as a Humidor.

Below are pictures