Often, you will find a decal or data plate on the right side of the gen set, or engine, when the generator has been reset. But not always. Its to the left of the coolant overflow bottle, most of the time. Gives info on the who, what and where of reset to that gen set.
The decal you are speaking about is normally applied when the set is finished reset, before shipping, to differentiate between a set ready to ship, and not ready to ship.