Memorial Day Weekend Sale Happy Memorial Day Weekend! To celebrate, we are offering 15% off site wide on www.mailboss.com with the coupon code USA2014. The coupon is valid for all purchases, Friday May 23, 2014 through Monday, May 26, 2014 only. No exceptions or extensions. Mail Boss Mail Boss is an innovative leader in USPS approved security mailboxes, launched in 2006 as a division of Epoch Design, LLC, a family-owned business based in Redmond, WA.