2-Keys for 2-Keys for Stack On/Sentinel/RangeMaxx Safes – Codes I-801 thru I-861 Safes using Key Code Series I-801 thru I-861. The key code is usually Stamped on the Original Keys and on the Side of the Lock. (Lock would have to be Removed). Make sure your key code matches the key code you are ordering. If they don’t match, the keys will not work. Insist on Safeco Brands for top quality Keys, Locks and Safes.