How To Find Key Number for 99 Suburban?

My keys for my 99 Suburban are starting to wear a little thin and not work the locks as smoothly as I'd like. The dealer can cut me new ones but he needs the key number. He can look up that info by my VIN but they charge a nice fee for that privilege. If I could find my key number it would save me a bit of cash. Does anyone know if that handy little sticker in the glove box that lists all those replacement part numbers includes the key number? How do I tell which one it is?

key codes are not listed any where. Unfortunately you have to go to the dealer.