Buell key codes are not located anywhere on the motorcycle itself. The only place you will find the key code is on a tag that came with the original keys when the motorcycle was bought new. If you have the original owners manual, it may be written in there. Buell motorcycles have ZADI ignitions. You will see this stamped on the ignition but it's not the key code.
Buell Key Code Ranges:
Buell also had some early tubular keys but cutting data isn't available for those.