You can post a request for your radio code here:
Lost Radio Code - post your request here - 986 Series (Boxster, Boxster S) - RennTech.org Forums
Before posting, turn on your radio and hold down the TP button for at least 10 seconds. "Becker 1" will be displayed. Rotate the right knob (slowly) and it will display the Becker model number. Then rotate it again and the serial number should be displayed on the radio. Post both of those numbers at the site above and Loren will post up your radio code.