BNIB Culprit Lizard King mens boxer briefs size L

I bought these for my Fiance 2 years ago (I checked my order history), and he refuses to wear them! He has no sense of humor. What can I do? Culprit tends to run small, so a large should fit like a medium. Culprit details, Mid-rise with a mid-thigh inseam and left-side fly Rise: 12” Inseam: 5 3/4” Rise & Inseam measurements taken from size M Looks all cute and sexy till you realize our totally unlicensed Not-Godzilla is tearing apart a Samurai village and eating Ronin like Ramen.