Help with radio code

Brad - I understand you can help with getting the correct radio code. Had to replace the battery in my 2002 Z3 3.0 two weeks ago. The radio is asking for a radio code. Pulled the unit to get the serial and model numbers, went to the dealer. They have given me two numbers neither of which work!! They can't explain why. The radio calls for a 5-digit number which the two given by the dealer are. The radio book says to press the right arrow key after entering the 5th digit. I do this and still getting absolutely nowhere!!! I bought the car second-hand so have no clue where the card with the code is.
Please help. Thank you!