I have the number 239, which on this list shows it to be a 18" alloy wheels option and also the number 411, which on this list shows it to be a 18" Carrera wheels option . Just as I suspected and someone swapped these older 911 17" wheels out for them. Grrrr!
Your wheels look like aftermarket Cup I wheels that were popular on the 964 and a direct fit for the Boxster. Decent wheels that are easy to clean but may bend easily if you hit a pothole. (don't ask me how I know)
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.