CD-Key does not work for Steam

[Mindset Matters]

i bought this game over 5 years ago from a local store together with Delta Force Land Warrior, now i found the CD's along with the Cases and CD-Keys, but this game is still so expensive so i wont buy it again, i still want to activate the keys in steam, but none of them worked, i did register with them at NovaWorld though. any suggestions?

[Mindset Matters]

ok thanks for your help, i found the list and this message : "Note: Only the retail games listed above can be registered through Steam. No other retail games can be registered and downloaded using Steam." that means those keys are useless to me now.

[IntrudeR]

buy it again if you liked it that much £2.39 cost more to chase up the old keys