- Ghost Unknown
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- Exalted Legendary Member
The only Halo demo ever released is on the Official UK XBox Magazine Demo Disc Issue 1; I still have my copy. It is a co-op enabled full playthrough of The Silent Cartographer.
The builds you are referring to are sitting somewhere secret in Bungie and/or Microsoft. There are currently no methods one can currently employ to gain copies of those builds, no matter how many uncle's nephew's father's daughter's sons who fixes the toilets at Bungie someone may know.
Maybe Bungie/Microsoft will have mercy in 10-15 years time and let us play/purchase those builds for pure nostalgia. One can only dream...