If you have Halo: Combat Evolved but don't have a CD-key, get one here. All keys can be used as many times as you want, but you will only need one. These can also be compatible with Halo Custom Edition CD-keys. Again, you only need one. As some Halo:Reach player might know, you can use a Halo: Combat Evolved CD-key to earn a nameplate. But one thing that most didn't know was that each can only be used once. Bungie keeps a record of all the CD-keys that were passed out inside the Halo: Combat Evolved PC. And once a key is entered the key is listed as an "Invalid key" and cannot be used again.
I might ve posting some halo 3 keys, no use for using them online but just for the nameplate. The generator has gone down due to a small patch bungie made for the halo 3 ones but I can still manage some.