Gentleman’s Box Coupon: Get a FREE Mystery Box! Posted by Hello Subscription on June 1, 2019. Father's Day Deals & Gift Boxes / Subscription Box Coupons & Deals / Gentleman's Box Coupons Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for Later Notification The Gentleman’s Box has a new BOGO sale for the Classic Box! Get a FREE Mystery Box when you sign up with coupon code BOGOFREE! Are you getting The Gentleman’s Box Classic Box?