Gentleman’s Box Coupon: Save $10 On First Box! Posted by Hello Subscription on May 24, 2019. Subscription Box Coupons & Deals / Gentleman's Box Coupons Make the first comment! Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for LaterGo to commentsNotification The Gentleman’s Box has a new sale for the Classic Box! Subscribe and get $10 off your first Classic Box when you use the coupon code GATEKEEPER! Are you getting The Gentleman’s Box Classic Box?