Halo 2 Easter Egg - Hidden Mesages at Coagulation/Beaver Creek.

OK, to find this egg, you have to be in Beaver Creek. Go to cliff side next to Blue Base, go past the alcove. Go to the small cliff jutting out of the side and find the other small cliff. There will be 3 rocks there. Hit them away to find a scratched up message, that reads 'Why Am I Here?' with some other writing there. Underneath that, it's very hard to see, it says -Not Sid. It's pretty hard to see, but you can. Also, if you go to Coagulation, I have forgotten what it says, but at the cave where the active camo/overshield spawn, the cliff in the cave where you see the water. If you get right on the edge of the cliff and look left you can see the hidden message.