If you take a look at the special airworthiness certificate that is issued for an Experimental/Amateur-Built aircraft, you will see the comment that it must be accompanied by the operating limitations. That means the operating limitations must be in the aircraft at all times. They do not have to be displayed, as does the airworthiness certificate. I find too many airplanes, especially those that have changed hands, to be missing the operating limitations. By the way, if you change your N-number, you will have to be issued a new airworthiness certificate and new operating limitations so they match again.
It is now possible for DARs and FSDO inspectors to generate the airworthiness certificate and operating limitations as one document, so hopefully this problem will dwindle in the future.