Do not put fresh cut cedar in a humidor under any circumstances. Unless it's Spanish cedar, in which case it's probably not fresh cut.
Any other variety of cedar besides Spanish will impart a distinct and strong odor and flavor of urine onto your cigars. It will also impart that odor to the rest of the wood in the humidor, and that odor is very difficult to remove. It doesn't take much to ruin a humidor. One common screw-up among custom builders is to build walk in humidors in custom houses made from what they think is perfectly acceptable nicely grained knot free cedar they got from the local woodcraft. The homeowner then fills the walk-in with $$$ of cigars that promptly get permanently ruined. Any cigar store owner will tell you stories about the irate wealthy customers that come in a few weeks after making a big multibox purchase, complaining that all their nice new cigars taste like pee.
If you ever have need of cigar cedar for any reason, including making your own matches, humidor dividers, extra ghetto humidors, etc. any good cigar shop will have a stack of it for free or very little money. One good trick is to grab a hand-full of cigar box dividers from the cigar shop cedar bin (they all have them, just ask) and split them with an X-acto knife. Light those with your regular butane lighter and then light your cigar with the cedar. Tasty. I know people that carry a little matchbook of cedar strips just for this reason. Keep in mind that that's the same kind of person that carries their own gourmet salt or hot sauce everywhere they go, so YMMV.
Put the box back on a flat surface, open the box (some boxes need a support under the lid to keep the hinges from bending) remove any and all dividers, humidification units or removable gauges and run a vacuum cleaner hose through the box thoroughly, and then let the sun shine into the box and onto the dividers for a day or two, and make sure to rotate the dividers. Do not leave the box out if there is a dew at night where you live.
Then close the box, throw it in the freezer for a couple days, and then take it out and leave it open in a dry place. Keep an eye on it to make sure there's no weird things happening like condensation or warping. If the box was dry that shouldn't happen. If there are any signs of glue like stains or gummyness, throw the humidor away. When at all, humidors only use glue on the outside of the box, never ever ever on the inside cedar sleeve.
As an optional step, get a clean cotton swab (like your wife's makeup swabs) dipped in grain alcohol (not rubbing alcohol, whiskey or any other alcohol with any flavor) and wet the surfaces inside the box evenly and let the box dry while it's open, THOROUGHLY.
Replace all gauges and internals (for peace of mind swabbed with grain alcohol) and let the box humidify for between one and two weeks, the longer the better. Check the box for any weirdness including new dust or things that look like sand grains before putting the cigars in.
I assume you know how to humidify your box, if not just ask.
FYI beetles are not by any means the only thing that can infest your humidor. You can get aphids, ants and any number of other little critters that are mostly harmless but not welcome. Usually all you need to do is swab with grain alcohol and vacuum, but sometimes there is an underlying problem like excessive humidity or fungus growth.