You are correct, Josh.

However, due to the year of the car, it is possible that the radio may have
been replaced somewhere down the line and that the records at MBUSA may not
have been changed to reflect this. In this case, the radio must be pulled out
and then you can get the radio code using the radio's serial number. Pulling
out the radio is a very simple procedure, when you have the right tool. If
you must pull the radio and you do not have the tool [why should you, you are
not in the business], I am sure your friendly MB store could do it for you.

You may want to tip the guy afterwards if he does not charge you.

Just my thoughts.

Monterey