Yale Certified Safes By incorporating several key elements in to our Certified models we have greatly improved performance. As a result the Yale safes have been awarded Silver Certification in the 'Sold Secure accreditation' Yale Certified Safe Home - YSM/250/EG1Laser cut steel door, with auto-opening function (when co… Yale Certified Safe Professional - YSM/520/EG1Electronic Lock digital keypad.