Don't try to play games with customs in the mail. It's a terrible idea.

If you get caught, you and the person you're shipping to will both end up having your name flagged in the CBP database. You'll be scrutinized at the border for all future international travel.

You'll also both be ineligible for trusted traveler programs going forward. There are threads on Reddit where somebody bought an item online from overseas, the seller lied on the customs form, the USPS noticed and seized it... and the unwitting buyer had their Global Entry membership permanently revoked because it counted as a customs import violation.

Just don't.