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If you have the original documentation that came with the car, you should be able to find them there. If not the only hope is to find a build sheet. One copy was glued to the top of the gas tank as the car went down the line. Would need to pull the tank to see if it is still there. More then likely the elements have gotten to it.
The build sheet was a multi-part carbon form. As workers used their copies on the line they would usualy throw them in the trash, but some would stick them in the car. They have been found under the rear carpet, in the seat springs, and under the dash in the wiring between the speedo and tach.
The RPO codes are not on a sticker like the C4/C5s have.