ONYXBOX Coupon: Free Boss Lady Box! Posted by Brandy on March 17, 2017. Subscription Box Coupons & Deals / ONYXBOX Coupons Make the first comment! Hello Subscription may earn compensation via links in this post. Read the full disclosure Save for LaterGo to commentsNotification ONYXBOX has released a new deal – get an extra BOSS LADY BOGO box, curated with products from black female led companies when you use coupon code BOSSLADYHS. Ends 3/18.